Selected publications Freksa



Christian Freksa:
KI und Kognition.
In Anna Strasser, Katja Stepec, Ralf Stapelfeldt, Wolfgang Sohst: Künstliche Intelligenz. Die große Verheißung. Xenomoi, Berlin



Christian Freksa, Maria Vasardani, Felix Kroll:
Dynamic problem solving in space.
Spatial Cognition XII, Jurģis Šķilters et al. (eds.); LNAI 12162, 18-32, Springer 2020


Christian Freksa:
Beyond spatial reasoning: Challenges for ecological problem solving.
JOSIS 20, 43-49 (2020)


Ming Tang, Zoe Falomir, Christian Freksa, Yehua Sheng, Haiyang Lyu:
Extracting invariant characteristics of sketch maps: Towards place query-by-sketch.
Transactions in GIS. 2020;00:1–41.



Christian Freksa, Thomas Barkowsky, Zoe Falomir, Jasper van de Ven:
Geometric problem solving with strings and pins.
Spatial Cognition & Computation 19 (1): 46-68 (2019)


Ashok K. Goel, Colleen M. Seifert, Christian Freksa:
Proceedings of the 41th Annual Meeting of the Cognitive Science Society, CogSci 2019: Creativity + Cognition + Computation, Montreal, Canada, July 24-27, 2019. 2019, ISBN 0-9911967-7-5 



Christian Freksa, Jasper van de VenDiedrich Wolter:
Formal representation of qualitative direction. 
International Journal of Geographical Information Science 32 (12): 2514-2534 (2018)


Ana-Maria OlteteanuZoe Falomir, Christian Freksa:
Artificial Cognitive Systems That Can Answer Human Creativity Tests: An Approach and Two Case Studies. 
IEEE Trans. Cognitive and Developmental Systems 10 (2): 469-475 (2018)


Christian Freksa:
Mild Abstraction in Spatial Problem Solving. 
CCIA 2018: 4-8


Jasper van de VenMunehiro FukudaHolger Schultheis, Christian Freksa, Thomas Barkowsky:
Analyzing Strong Spatial Cognition: A Modeling Approach. 
Spatial Cognition 2018: 197-208


Yun-Ming ShihCollin GordonMunehiro FukudaJasper van de Ven, Christian Freksa:
Translation of String-and-Pin-based Shortest Path Construction into Data-Scalable Agent-based Computational Models. 
WSC 2018: 881-892


Jasper van de Ven, Ahmed Loai Ali, Thomas Barkowsky, Christian Freksa, Michael Epprecht, Thatheva Saphangthong, Peter Haddawy:
Mobile decision support for yellow-spined bamboo locust plague intervention.
Location Based Services 2018: 56-62


Christian Freksa, Thomas Barkowsky, Frank Dylla, Zoe Falomir, Ana-Maria Olteteanu, Jasper van de Ven:
Spatial problem solving and cognition.
In Jefferey Zacks, Holly Taylor: Representations in Mind and World, 156-183, Routledge, New York, 2018



Ahmed Loai AliJasper van de VenThatheva Saphangthong, Christian Freksa, Thomas BarkowskySithong ThongmanivongHoungphet ChanthavongPeter Haddawy:
Experience with the Mobile4D Disaster Reporting and Alerting System in Lao PDR. 
ICT4D2017: 525-535


Christian Freksa, Ana-Maria OlteteanuThomas BarkowskyJasper van de VenHolger Schultheis:
Spatial Problem Solving in Spatial Structures. 
MIWAI 2017: 18-29


Christian Freksa, Arne Kreutzmann:
Neighborhood, Conceptual.
The International Encyclopedia of Geography, 1-12, Wiley-Blackwell, Hoboken, 2017


Ahmed Loai Ali, Zoe Falomir, Falko Schmid, Christian Freksa:
Rule-guided human classification of volunteered geographic information.
ISPRS Journal of Photogrammetry and Remote Sensing 127, 3-15 (2017)



Marco RagniThomas BarkowskyBernhard Nebel, Christian Freksa:
Cognitive Space and Spatial Cognition: The SFB/TR 8 Spatial Cognition. 
KI 30 (1): 83-88 (2016)


Ulrich FurbachFlorian Furbach, Christian Freksa:
Relating Strong Spatial Cognition to Symbolic Problem Solving - An Example.
CoRR abs/1606.04397 (2016)


Rainer Malaka, Frank Dylla, Christian Freksa, Thomas Barkowsky, Marc Herrlich, Ron Kikinis:
Intelligent support for surgeons in the operating room.
In Mihai Nadin: Anticipation and Medicine, 269-277, Springer, 2016



Christian Freksa:
Computational Problem Solving in Spatial Substrates - A Cognitive Systems Engineering Approach. 
Int. J. Software and Informatics 9 (2): 279-288 (2015)


Jasper van de VenDimitra AnastasiouFrank DyllaSusanne Boll, Christian Freksa:
The SOCIAL Project - Approaching Spontaneous Communication in Distributed Work Groups. AmI 2015: 171-186


Christian Freksa:
Strong Spatial Cognition. 
COSIT 2015: 65-86


Mehul Bhatt, Christian Freksa:
Spatial computing for design: An artificial intelligence perspective.
In John Gero: Studying visual and spatial reasoning for design creativity, 109-127, Springer, Berlin 2015



Christian Freksa, Bernhard NebelMary HegartyThomas Barkowsky:
Spatial Cognition IX - International Conference, Spatial Cognition 2014, Bremen, Germany, September 15-19, 2014. Proceedings.
Lecture Notes in Computer Science 8684, Springer 2014, ISBN 978-3-319-11214-5 [contents]


Christian Freksa:
Informatik zwischen Computern und Realität.
In Anja Zeising, Claude Draude, Heidi Schelhowe, Susanne Maass S:
Vielfalt der Informatik - Ein Beitrag zu Selbstverständnis und Außenwirkung, 177-178,
Staats- und Universitätsbibliothek Bremen, 2014


Christian Freksa, Holger Schultheis:
Three ways of using space.
In Daniel R Montello, Karl E Grossner, Donald G Janelle DG: Space in mind: Concepts for spatial learning and education. Cambridge, 31-48, MIT Press, Cambridge, MA, 2014



Christian Freksa:
Understanding Cognition through Synthesis and Analysis. 
Int. J. Software and Informatics 7 (1): 3-18 (2013)


Arne KreutzmannImmo ColoniusDiedrich WolterFrank DyllaLutz Frommberger, Christian Freksa:
Temporal logic for process specification and recognition. 
Intelligent Service Robotics 6 (1): 5-18 (2013)


Mehul BhattJakob Suchan, Christian Freksa:
Rotunde - A Smart Meeting Cinematography Initiative - Tools, Datasets, and Benchmarks for Cognitive Interpretation and Control.
AAAI Workshop: Space, Time, and Ambient Intelligence 2013


Falko SchmidLutz FrommbergerChunyuan Cai, Christian Freksa:
What You See is What You Map: Geometry-Preserving Micro-Mapping for Smaller Geographic Objects with mapIT. 
AGILE Conf. 2013: 3-19


Christian Freksa:
The Power of Space and Time - How Spatial and Temporal Structures Can Replace Computational Effort. 
AIC@AI*IA 2013: 10


Mehul Bhatt, Carl Schultz, Christian Freksa:
The ‘Space’ in Spatial Assistance Systems.
In Thora Tenbrink, Jan Wiener, Christophe Claramunt: Representing Space in Cognition: Behaviour, Language, and Formal Models, 171-214, Oxford University Press, 2013


Christian Freksa:
Spatial Computing – How spatial structures replace computational effort.
In Martin Raubal, David Mark, Andrew Frank: Cognitive and linguistic aspects of geographic space, 23-42, Springer, Berlin, 2013


Christian Freksa:
Fuzzy relations and cognitive representations.
In Rudolf Seising, Enric Trillas, Claudio Moraga, Settimo Termini: On Fuzziness – A Homage to Lotfi A. Zadeh, vol 1, 183-190, Springer, Heidelberg 2013



Stephan Winter, Christian Freksa:
Approaching the notion of place by contrast.
JOSIS 5 (1): 31-50 (2012)


Jan Frederik Sima, Christian Freksa:
Towards Computational Cognitive Modeling of Mental Imagery - The Attention-Based Quantification Theory. 
KI 26 (3): 261-267 (2012)


Mehul Bhatt, Christian Freksa:
Analytical computing for spatial design: An artificial intelligence perspective.
First Annual Conference on Advances in Cognitive Systems, 35-52, Palo Alto, 2012


Elisabeth Weissensteiner, Christian Freksa:
Wolkenkuckucksheim: Art as metaphor of the mind.
Leonardo 45 (5): 414-422 (2012)


Christian Freksa:
R. L. d. M. – Scholar, Engineer, Leader, Advisor, Artist, and Friend.
In Carles Sierra: Festschrift in honour of Ramón López de Mántaras, 247-250, IIIA, CSIC, Barcelona 2012



Bernhard Nebel, Christian Freksa:
AI Approaches to Cognitive Systems - The Example of Spatial Cognition. 
Informatik Spektrum 34 (5): 462-468 (2011)


Arne KreutzmannImmo ColoniusLutz FrommbergerFrank Dylla, Christian Freksa, Diedrich Wolter:
On Process Recognition by Logical Inference. 
ECMR 2011: 7-12



Christian Freksa, Holger SchultheisKerstin SchillThora TenbrinkThomas BarkowskyChristoph HölscherBernhard Nebel:
Spatial Cognition: Reasoning, Action, Interaction. 
KI 24 (4): 329-334 (2010)


Torsten Hildebrand, Lutz Frommberger, Diedrich Wolter, Christian Zabel, Bernd Scholz-Reiter, Christian Freksa:
Towards optimization of manufacturing systems using autonomous robotic observers.
Proc 7th CIRP International Conf on Intelligent Computation in Manufacturing Engineering (ICME 2010), Capri, Italy 2010



Thora Tenbrink, Christian Freksa:
Contrast sets in spatial and temporal language.
Cognitive Processing 10: 322-324 (2009)



Diedrich WolterFrank DyllaStefan WölflJan Oliver WallgrünLutz FrommbergerBernhard Nebel, Christian Freksa:
SailAway: Spatial Cognition in Sea Navigation. 
KI 22 (1): 28-30 (2008)


Christian Freksa:
Spatial Cognition: Agents between Sensation and Reality. 


Diedrich Wolter, Christian Freksa, Longin Jan Latecki:
Towards a Generalization of Self-localization. 
Robotics and Cognitive Approaches to Spatial Mapping 2008: 105-134


Christian Freksa, Nora S. NewcombePeter GärdenforsStefan Wölfl:
Spatial Cognition VI. Learning, Reasoning, and Talking about Space, International Conference Spatial Cognition 2008, Freiburg, Germany, September 15-19, 2008. Proceedings. 
Lecture Notes in Computer Science 5248, Springer 2008, ISBN 978-3-540-87600-7 [contents]


Sven Bertel, Thomas Barkowsky, Christian Freksa:
Mental model-centered design for built environments.
In Saif Haq, Christoph Hölscher, Sue Torgrude: Proc. EDRAMOVE workshop on "Movement and orientation in built environments: evaluating design rationale and user cognition", 13-19, SFB/TR 8 Report No. 015-05/2008, Bremen, 2008


Christian Freksa:
Zur interdisziplinären Erforschung räumlichen Denkens.
In Günter D Rey, Thomas Wehr: Kognitive Psychologie – Ausgewählte Grundlagen- und Anwendungsbeispiele, 87-108Pabst Science Publishers, Lengerich 2008



Christian Freksa, Sven Bertel:
Eye movements and smart technology. 
Comp. in Bio. and Med. 37 (7): 983-988 (2007)


Inessa SeifertThomas Barkowsky, Christian Freksa:
Region-Based Representation for Assistance with Spatio-Temporal Planning in Unfamiliar Environments. 
Location Based Services and TeleCartography 2007: 179-191


Anthony G. Cohn, Christian Freksa, Bernhard Nebel:
Spatial Cognition: Specialization and Integration, 04.12. - 09.12.2005. 
Dagstuhl Seminar Proceedings 05491, Internationales Begegnungs- und Forschungszentrum fuer Informatik (IBFI), Schloss Dagstuhl, Germany 2007 [contents]


Christian Freksa, Michael KohlhaseKerstin Schill:
KI 2006: Advances in Artificial Intelligence, 29th Annual German Conference on AI, KI 2006, Bremen, Germany, June 14-17, 2006, Proceedings.
Lecture Notes in Computer Science 4314, Springer 2007, ISBN 978-3-540-69911-8 [contents]


Sven Bertel, Georg Vrachliotis, Christian Freksa:
Aspect-oriented building design: Towards computer-aided approaches to solving spatial constraint problems in architecture.
In Gary L Allen: Applied spatial cognition: From research to cognitive technology, 75-102, Lawrence Erlbaum, Mahwah, NJ, 2007



Jan Oliver WallgrünLutz FrommbergerDiedrich WolterFrank Dylla, Christian Freksa:
Qualitative Spatial Representation and Reasoning in the SparQ-Toolbox. 
Spatial Cognition 2006: 39-58


Alexander Klippel, Christian Freksa, Stephan Winter:
You-Are-Here maps in emergencies – the danger of getting lost. 
Journal of Spatial Science 51, 1, 117-131, 2006


Sven Bertel, Thomas Barkowsky, Peter König, Holger Schultheis, Christian Freksa:
Sketching mental images and reasoning with sketches: NEVILLE – a computational model of mental & external spatial problem solving.
In Danilo Fum, Fabio del Missier, Andrea Stocco: Proc 7thIntern Conf on Cognitive Modeling, ICCM ’06, 349-350, Edizioni Goliardiche, Trieste 2006


Sven Bertel, Thomas Barkowsky, Dominik Engel, Christian Freksa:
Computational modeling of reasoning with mental images: basic requirements.
In Danilo Fum, Fabio del Missier, Andrea Stocco: Proc 7thIntern Conf on Cognitive Modeling, ICCM ’06, 50-55, Edizioni Goliardiche, Trieste 2006



Michael L. AndersonThomas BarkowskyPauline BerryDouglas S. BlankTimothy ChklovskiPedro M. DomingosMarek J. Druzdzel, Christian Freksa, John GershMary HegartyTze-Yun LeongHenry LiebermanRic K. LoweSusann LuperfoyRada MihalceaLisa MeedenDavid P. MillerTim OatesRobert L. PoppDaniel G. ShapiroNathan SchurrPush SinghJohn Yen:
Reports on the 2005 AAAI Spring Symposium Series. 
AI Magazine 26 (2): 87-92 (2005)


Thomas BarkowskyJohn A. Bateman, Christian Freksa, Wolfram BurgardMarkus Knauff:
Transregional Collaborative Research Center SFB/TR 8 Spatial Cognition: Reasoning, Action, Interaction (Sonderforschungsbereich/Transregio SFB/TR 8 Raumkognition: Schließen, Handeln, Interagieren). 
it - Information Technology 47 (3): 163-171 (2005)


Thomas Barkowsky, Christian Freksa, Markus Knauff
Special Issue: "Spatial and Visual Components in Mental Reasoning About Space" Editorial. Spatial Cognition & Computation 5 (2-3): 115-117 (2005)


Thomas Barkowsky, Christian Freksa, Mary HegartyRic K. Lowe:
Organizing Committee. 
AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance 2005


Thomas Barkowsky, Christian Freksa, Mary HegartyRic K. Lowe:
Preface: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance. 
AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance 2005


Christian Freksa, Thomas Barkowsky:
Raumkognition aus der Perspektive der KI. 
GI Jahrestagung (2) 2005: 665


Anthony G. Cohn, Christian Freksa, Bernhard Nebel:
05491 Abstracts Collection -- Spatial Cognition: Specialization and Integration. 
Spatial Cognition: Specialization and Integration 2005


Christian Freksa:
05491 Executive Summary -- Spatial Cognition: Specialization and Integration. 
Spatial Cognition: Specialization and Integration 2005


Christian Freksa, Alexander KlippelStephan Winter:
A Cognitive Perspective on Spatial Context. 
Spatial Cognition: Specialization and Integration 2005


Alexander Klippel, Kai-Florian Richter, Thomas Barkowsky, Christian Freksa:
The cognitive reality of schematic maps.
In Liqiu Meng, Alexander Zipf, Tumasch Reichenbacher: Map-based Mobile Services - Theories, Methods and Implementations, 57-74Springer, Berlin, 2005.



Christian Freksa:
Spatial Cognition: An AI Perspective. 
ECAI 2004: 1122-1128


Alexander KlippelLothar KnufBernhard Hommel, Christian Freksa:
Perceptually Induced Distortions in Cognitive Maps. 
Spatial Cognition 2004: 204-213


Max J. Egenhofer, Christian Freksa, Harvey J. Miller:
Geographic Information Science, Third International Conference, GIScience 2004, Adelphi, MD, USA, October 20-23, 2004, Proceedings. 
Lecture Notes in Computer Science 3234, Springer 2004, ISBN 3-540-23558-2 [contents]


Christian Freksa, Markus KnauffBernd Krieg-BrücknerBernhard NebelThomas Barkowsky:
Spatial Cognition IV: Reasoning, Action, Interaction, International Conference Spatial Cognition 2004, Frauenchiemsee, Germany, October 11-13, 2004, RevisedSelected Papers. Lecture Notes in Computer Science 3343, Springer 2004, ISBN 3-540-25048-4 [contents]


Alexander Klippel, Carsten Dewey, Markus Knauff, Kai-Florian Richter, Daniel R Montello, Christian Freksa, Esther-Anna Loeliger:
Direction Concepts in Wayfinding Assistance Systems.
In Jörg Baus, Christian Kray, Robert Porzel: Artificial Intelligence in Mobile Systems  (AIMS'04 Nottingham), SFB 378 Memo 84, 1-8, Saarbrücken 2004


Sven Bertel, Christian Freksa, Georg Vrachliotis:
Aspectualize and conquer.
In John S Gero, Barbara Tversky, Terry Knight: Visual and Spatial Reasoning in Design III, 255-279, Key Centre of Design Computing and Cognition, University of Sydney, 2004


Kai-Florian Richter, Alexander Klippel, Christian Freksa:
Shortest, fastest, -- but what next? A different approach to route directions.
In Martin Raubal, Adam Sliwinski, Werner Kuhn:Geoinformation und Mobilität – von der Forschung zur praktischen Anwendung, Beiträge zu den Münsteraner GI-Tagen, 205-217, IfGI prints, Universität Münster 2004



Reinhard MoratzBernhard Nebel, Christian Freksa:
Qualitative Spatial Reasoning about Relative Position: The Tradeoff between Strong Formal Properties and Successful Reasoning about Route Graphs. 
Spatial Cognition 2003: 385-400


Christian Freksa, Wilfried BrauerChristopher HabelKarl Friedrich Wender:
Spatial Cognition III, Routes and Navigation, Human Memory and Learning, Spatial Representation and Spatial Learning. 
Lecture Notes in Computer Science 2685, Springer 2003, ISBN 3-540-40430-9 [contents]


Thomas Barkowsky, Christian Freksa:
Transregional Collaborative Research Center SFB/TR 8 Spatial Cognition: Reasoning - Action – Interaction.
In Franz Schmalhofer, Richard M Young, Graham Katz: Proceedings of EuroCogSci 2003, 453–454. Lawrence Erlbaum, Mahwah, NJ


Thomas Barkowsky, Sven Bertel, Dominik Engel, Christian Freksa:
Design of an architecture for reasoning with mental images.
In International Workshop on Spatial and Visual Components in Mental Reasoning about Large-Scale Spaces, Bad Zwischenahn, 2003



Markus KnauffChristoph Schlieder, Christian Freksa:
Spatial Cognition: From Rat-Research to Multifunctional Spatial Assistance Systems. 
KI 16 (4): 5-9 (2002)


Christian Freksa:
Spatial Cognition.
KI 4/2002 Special issue



Christian Freksa, Rudolf KruseRamón López de Mántaras:
Interview with Prof. Lotfi A. Zadeh. 
KI 15 (3): 40-43 (2001)


Joe Heike SteinhauerTom Wiese, Christian Freksa, Thomas Barkowsky:
Recognition of Abstract Regions in Cartographic Maps. 
COSIT 2001: 306-321



Hernan CasakinThomas BarkowskyAlexander Klippel, Christian Freksa:
Schematic Maps as Wayfinding Aids. 
Spatial Cognition 2000: 54-71


Christian Freksa, Reinhard MoratzThomas Barkowsky:
Schematic Maps for Robot Navigation. 
Spatial Cognition 2000: 100-114


Christian Freksa, Wilfried BrauerChristopher HabelKarl Friedrich Wender:
Spatial Cognition II, Integrating Abstract Theories, Empirical Studies, Formal Methods, and Practical Applications. 
Lecture Notes in Computer Science 1849, Springer 2000, ISBN 3-540-67584-1 [contents]


Reinhard Moratz, Christian Freksa, Thomas Barkowsky:
Diagrammatic instruction maps for human-robot interaction.
In Thomas Röfer, Axel Lankenau, Reinhard Moratz: Service robotics - Applications and safety issues in an emerging market.Workshop Notes. ECAI 2000, Berlin


Christian Freksa, Reinhard Moratz, Thomas Barkowsky:
Robot navigation with schematic maps.
In Enrico Pagello, Frans Groen, Tamio Arai, Rüdiger Dillmann, Anthony Stentz: Intelligent Autonomous Systems 6, 809-816, Amsterdam: IOS Press 2000



David M. Mark, Christian Freksa, Stephen C. HirtleRobert LloydBarbara Tversky:
Cognitive models of geographical space. 
International Journal of Geographical Information Science 13 (8): 747-774 (1999)


Christian Freksa, David M. Mark:
Spatial Information Theory: Cognitive and Computational Foundations of Geographic Information Science, International Conference COSIT '99, Stade, Germany, August 25-29, 1999, Proceedings.
Lecture Notes in Computer Science 1661, Springer 1999, ISBN 3-540-66365-7 [contents]


Christian Freksa, Thomas Barkowsky, Alexander Klippel:
Spatial symbol systems and spatial cognition: A computer science perspective on perception-based symbol processing.
Behavioral and Brain Sciences 22, 4, 616-617 (1999)


Christian Freksa:
Spatial aspects of task-specific wayfinding maps: A representation-theoretic perspective.
In John S Gero, Barbara Tversky: Visual and Spatial Reasoning in Design, 15-32, Key Centre of Design Computing and Cognition, University of Sydney, 1999


Christian Freksa:
Links vor – Prototyp oder Gebiet? Probabilistische und possibilistische Raumbeschreibung.
In Gert Rickheit: Richtungen im Raum, 231-246, Deutscher Universitäts-Verlag, Wiesbaden 1999


Christian Freksa, Thomas Barkowsky:
On the duality and on the integration of propositional and spatial representations.
In Christopher Habel, Gert Rickheit: Mental models in discourse processing and reasoning, 195-212, Elsevier, Amsterdam 1999



Bettina BerendtThomas Barkowsky, Christian Freksa, Stephanie Kelter:
Spatial Representation with Aspect Maps. 
Spatial Cognition 1998: 313-336


Christian Freksa, Christopher HabelKarl Friedrich Wender:
Spatial Cognition, An Interdisciplinary Approach to Representing and Processing Spatial Knowledge. 
Lecture Notes in Computer Science 1404, Springer 1998, ISBN 3-540-64603-5 [contents]


Reinhard Moratz, Christian Freksa:
Spatial reasoning with uncertain data using stochastic relaxation.
In Wilfried Brauer: Fuzzy-Neuro Systems ’98, 106-112, Proc. in Artificial Intelligence 7, Infix-Verlag, St. Augustin 1998



Christian Freksa:
Spatial and Temporal Structures in Cognitive Processes. 
Foundations of Computer Science: Potential - Theory - Cognition 1997: 379-387


Thomas Barkowsky, Christian Freksa:
Cognitive Requirements on Making and Interpreting Maps. 
COSIT 1997: 347-361


Steffen WernerBernd Krieg-BrücknerHanspeter A. MallotKarin Schweizer, Christian Freksa:
Spatial Cognition: The Role of Landmark, Route, and Survey Knowledge in Human and Robot Navigation. 
GI Jahrestagung 1997: 41-50


Christian Freksa, Matthias JantzenRüdiger Valk:
Foundations of Computer Science: Potential - Theory - Cognition, to Wilfried Brauer on the occasion of his sixtieth birthday. 
Lecture Notes in Computer Science 1337, Springer 1997, ISBN 3-540-63746-X [contents]


Thomas Barkowsky, Christian Freksa, Bettina Berendt, Stephanie Kelter:
Aspektkarten – Integriert räumlich-symbolische Repräsentationsstrukturen.
In Carla Umbach, Michael Grabski, Robin Hörnig R: Perspektive in Sprache und Raum, 147-168, Deutscher Universitätsverlag, Wiesbaden 1997



Kai Zimmermann, Christian Freksa:
Qualitative Spatial Reasoning Using Orientation, Distance, and Path Knowledge. 
Appl. Intell. 6 (1): 49-58 (1996)


Gerhard Strube, Barbara Becker, Christian Freksa, Udo Hahn, Klaus Opwis, Günther Palm:
Wörterbuch der Kognitionswissenschaft.
Klett-Cotta, Stuttgart 1996


Wolfgang H Zangemeister, H Siegfried Stiehl, Freksa C:
Visual attention and cognition.
North-Holland, Amsterdam 1996


Thomas Barkowsky, Ralf Röhrig, Christian Freksa:
Operationalizing diagrammaticity.
ECAI-96 Workshop on Representations and processes between vision and natural language, Budapest 1996


Christian Freksa, Thomas Barkowsky:
On the relation between spatial concepts and geographic objects.
In Peter Burrough, Andrew Frank: Geographic objects with indeterminate boundaries, 109-121, Taylor and Francis, London 1996



Christian Freksa:
KI und Kognition.
Themenheft KI 9, 6, 1995


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Longin Latecki, Ralf Röhrig:
Qualitative orientation and navigation using purposive vision. 
Arbeitspapier Nr. 25, Graduierten­kolleg Kognitionswissenschaft, Universität Hamburg, 1995


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Longin Latecki, Ralf Röhrig:
Movies: an integrated space-time representation for qualitative navigation (extended abstract). In Bernd Krieg-Brückner, Christoph Herwig: Kognitive Robotik, ZKW Bericht 3/95, Universität Bremen 1995


Carola Eschenbach, Christian Freksa, Christopher Habel:
Themenheft Kognitions­wissen­schaft 4, 4, 1995


Wolfgang H Zangemeister, Ulrich Öchsner, Christian Freksa:
Short-term adaptation of eye movements in patients with visual hemifield defects indicates high level control of human scanpath.
Optometry & Vision Science, 72, 7, 467-477 (1995)



Christian Freksa:
Responses to Elkan (Christian Freksa). 
IEEE Expert 9 (4): 20-21 (1994)


Christian Freksa:
Fuzzy systems in AI: An overview.
In Rudolf Kruse, Jörg Gebhardt, Rainer Palm: Fuzzy systems in computer science, 155-169, Vieweg, Braunschweig 1994


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Thiemo Krink, Ralf Röhrig, Antje Wulf:
The Realator: how to construct reality.
In Rita V Rodríguez: ECAI’94 Workshop W12 Spatial and temporal reasoning, 19-26, Amsterdam 1994



Kai Zimmermann, Christian Freksa:
Qualitatives räumliches Schließen mit Wissen über Richtungen, Entfernungen und Pfade. 
KI 7 (4): 21-28 (1993)


John YenPiero P. BonissoneDidier Dubois, Christian Freksa, Ramón López de MántarasEnrique H. RuspiniLotfi A. Zadeh:
Fuzzy Logic and AI. 
IJCAI 1993: 1673-1676


Wolfgang H Zangemeister, Steffen Egner, Fritz Dannheim, Christian Freksa:
Short-term adaptation of search-scan- & reading-path in patients with stroke-related visual field defects.
Intern. Congr. on stroke rehabilitation, Berlin, 1993


Christian Freksa, Ralf Röhrig:
Dimensions of qualitative spatial reasoning.
In Nuria Piera Carreté, Madan G Singh: Qualitative reasoning and decision technologies, 483-492, CIMNE, Barcelona 1993


Kai Zimmermann, Christian Freksa:
Enhancing spatial reasoning by the concept of motion.
In Aaron Sloman, David Hogg, Glyn Humphreys, Allan Ramsay: Prospects for Artificial Intelligence, 140-147, IOS-Press, Amsterdam 1993



Christian Freksa:
Temporal Reasoning Based on Semi-Intervals. 
Artif. Intell. 54 (1): 199-227 (1992)


Christian Freksa:
Über den Unterschied zwischen logik-basierten und logischen Ansätzen zur Wissensrepräsentation. 
KI 6 (3): 95-98 (1992)


Christian Freksa:
Using Orientation Information for Qualitative Spatial Reasoning. 
Spatio-Temporal Reasoning 1992: 162-178


Christian Freksa, Kai Zimmermann:
On the utilization of spatial structures for cognitively plausible and efficient reasoning.
Proc. SMC’92 – 1992 IEEE Intern. Conf. Systems Man and Cybernetics, 261-266, Chicago 1992



Christian Freksa:
Conceptual neighborhood and its role in temporal and spatial reasoning.
In Madan G Singh, Louise Travé-Massuyès: Decision Support Systems and Qualitative Reasoning, 181-187, North-Holland, Amsterdam 1991


Christian Freksa:
Qualitative spatial reasoning.
In David M Mark, Andrew U Frank: Cognitive and linguistic aspects of geographic space, 361-372, Kluwer, Dordrecht, 1991



Christian Freksa, Christopher Habel:
Warum interessiert sich die Kognitionsforschung für die Darstellung räumlichen Wissens? Repräsentation und Verarbeitung räumlichen Wissens 1990: 1-15


Christian Freksa, Christopher Habel:
Repräsentation und Verarbeitung räumlichen Wissens. 
Informatik-Fachberichte 245, Springer 1990, ISBN 3-540-52758-3 [contents]


Petra Bräunling, Christian Freksa, Kai Zimmermann:
The SpaceGarden bibliography.
In Christian Freksa, Christopher Habel: Repräsentation und Verarbeitung räumlichen Wissens, Informatik-Fachberichte 245, 267-353, Springer, Berlin 1990


Christian Freksa, Petra Bräunling, Kai Zimmermann:
The SpaceGarden interface for an interdisciplinary bibliography system.
Report, Institut für Informatik, Technische Universität München 1990



Christian Freksa:
Wissensdarstellung und Kognitionsforschung. 
it - Informationstechnik 31(2): 134-140 (1989)


Wilfried Brauer, Christian Freksa:
Wissensbasierte Systeme, 3. Internationaler GI-Kongress, München, 16./17. Oktober 1989, Proceedings. 
Informatik-Fachberichte 227, Springer 1989, ISBN 3-540-51838-X [contents]


Wilfried Brauer, Christian Freksa, and the AI/Cognition Group:
Connectionist approaches to the description of spatial knowledge.
Report FKI-98-89, TU München 1989



Christian Freksa:
Mit welchen Themen soll sich die KI auseinandersetzen? 
GWAI 1988: 327-333


Christian Freksa, Daniel Hernández, Matthias Marcinowski, Jürgen Schmidhuber:
Sprachartige Beschrei­bung von Objekten und räumlichen Gegebenheiten in einem konnektionistischen System.Skizze eines Forschungsprojektes.
In Christoph Lischka, Jörg Kindermann: Workshop Konnektionismus, GMD Berichte, St. Augustin 1988


Ulrich Furbach, Christian Freksa, Gerhard Dirlich:
Wissensrepräsentation in künstlichen symbol­verarbeitenden Systemen.
In Heinz Mandl, Hans Spada: Wissenspsychologie, 505-528, Psychologie Verlags Union, München 1988



Christian Freksa:
Spezielle Sektion: Kognition - Wissensstrukturen beim Aufgabenlösen.
GWAI1987: 277



Nur Erol, Christian Freksa:
An Approach to Structuring and Formalizing Knowledge for a Design Support System. 
AIMSA 1986: 271-279


Christian Freksa:
Cognitive Science - Eine Standortbestimmung. 
Wissensarten und ihre Darstellung 1986: 1-12


Christian Freksa:
Intrinsische vs. extrinsische Repräsentation zum Aufgabenlösen oder die Verwandlung von Wasser in Wein. 
Wissensarten und ihre Darstellung 1986: 155-165


Gerhard Dirlich, Christian Freksa, Uta SchwatloKlaus Wimmer:
Kognitive Aspekte der Mensch-Computer-Interaktion, Workshop, München, 12.-13. April 1984. Informatik-Fachberichte 120, Springer1986, ISBN 3-540-16450-2 [contents]


Christian Freksa:
Knowledge representation for interactive aircraft design.
In Thomas Bernold: Expert systems and knowledge engineering, 221-230, North-Holland, Amsterdam 1986



Gerhard Dirlich, Ulrich Furbach, Christian Freksa:
Aspekte der Wissensrepräsentation in künstlichen Systemen.
In Heinz Mandl, Peter Michael Fischer: Lernen im Dialog mit dem Computer, 121-130. Urban & Schwarzenberg, München 1985


Christian Freksa, Ulrich Furbach, Gerhard Dirlich:
Cognition and Representation.
In Joachim Laubsch: GWAI-84. 8th German Workshop on Artificial Intelligence, 119-144, Springer, Berlin 1985



Ulrich FurbachGerhard Dirlich, Christian Freksa:
Towards a Theory of Knowledge Representation Systems. 
AIMSA 1984: 77-84


Christian Freksa, Ulrich FurbachGerhard Dirlich:
Cognition and Representation - An Overview of Knowledge Reprensentation Issues in Cognitive Science. 
GWAI 1984: 119-144


Gerhard DirlichHelmut von Benda, Christian Freksa, Ulrich FurbachAlbrecht MüllerKlaus Wimmer:
Computerunterstützte Planung von Ferienreisen ein fiktiven Beispiel. 
Kognitive Aspekte der Mensch-Computer-Interaktion 1984: 22-36


Peter Haddawy, Christian Freksa:
A description of knowledge representation features for a design support system. 
Report  ATP-29-V-84, Forschungsgruppe Künstliche Intelligenz, Institut für Informatik, Technische Universität München 1984



Gerhard Dirlich, Christian Freksa, Ulrich Furbach:
A central problem in representing human knowledge in artificial systems: the transformation of intrinsic into extrinsic representations.
Proc. 5th Cognitive Science Conference, Session #6, 7-11, Rochester 1983


Wolfgang Bibel, Maurice Bruynooghe, Christian Freksa, Peter Haddawy, M Moreau:
An overview of formalisms, issues, languages, and systems for the representation of knowledge.
Report ATP-22-XII-83, Institut für Informatik, Technische Universität München 1983



Christian Freksa, Ramon López de Mántaras:
An adaptive computer system for linguistic categori­zation of "soft" observations in expert systems and in the social sciences.
Proc. 2nd World Conf. on Mathematics at the service of man, Las Palmas 1982


Christian Freksa:
Linguistic description of human judgments in expert systems and in the ‘soft’ sciences. 
In Madan M Gupta, Elie Sanchez: Approximate reasoning in decision analysis, 297-305, North-Holland, Amsterdam 1982


Christian Freksa:
In Avron Barr, Edward A Feigenbaum: The Handbook of Artificial Intelligence, vol. 2, Heuristech Press, Stanford 1982



Ramon López de Mántaras, Christian Freksa, Josep Aguilar-Martín:
Algorisme d´adaptació recursiva de funcions de possibilitat per a l´aprenentatge de la significació de conceptes imprecisos.
Convencion de Informatica Latina, 250-257, Barcelona 1981


Christian Freksa:
Linguistic pattern characterization and analysis.
Ph.D. thesis, Department of Electrical Engineering and Computer Sciences, University of California, Berkeley 1981



Christian Freksa:
Communication about visual patterns by means of fuzzy characterizations.
XXIInd Intern. Congress of Psychology, Leipzig 1980


Christian Freksa:
L-FUZZY -- an AI language with linguistic modification of patterns.
ERL Memo No. UCB/ERL M80/10,Electronics Research Laboratory, University of California, Berkeley 1980



Lawrence W Stark, Steven Ellis, HiromitsuInoue, Christian Freksa, ZiporaPortnoy, JoshuaZeevi:
Cognitive models direct scanpath eye movements: evidence obtained by means of computer processing of perceptual scanpath eye movements.
XII Intern. Conference on Medical & Biological Engineering, Jerusalem 1979



Christian Freksa:
The future of AI and its impact on society.
SIGART  67, 7-9 (1978)



Christian Friedrich-Freksa:
SOMNIA -- Design and development of an interactive on-line data management system for biomedical applications.
M.S. thesis, Department of Electrical Engineering & Computer Sciences, University of California, Berkeley 1976



Gerhard Dirlich, Christian Friedrich-Freksa, Hartmut Schulz:
A time-dependent model of the sleep EEG.
In Werner P Koella, P Levin: Sleep, 253-257, Karger, Basel 1973


Wolfgang Probst, Hartmut Schulz, Gerhard Dirlich, Heidi Schuh, Christian Friedrich-Freksa:
On-line classifi­cation of sleep stages with a lab computer.
In Uros J Jovanovic: The Nature of Sleep, 9-12, Gustav Fischer Verlag, Stuttgart 1973