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  1. Temporal reasoning based on semi-intervals.Christian Freksa - 1992 - Artificial Intelligence 54 (1-2):199-227.
  2.  20
    Spatial symbol systems and spatial cognition: A computer science perspective on perception-based symbol processing.Christian Freksa, Thomas Barkowsky & Alexander Klippel - 1999 - Behavioral and Brain Sciences 22 (4):616-617.
    People often solve spatially presented cognitive problems more easily than their nonspatial counterparts. We explain this phenomenon by characterizing space as an inter-modality that provides common structure to different specific perceptual modalities. The usefulness of spatial structure for knowledge processing on different levels of granularity and for interaction between internal and external processes is described. Map representations are discussed as examples in which the usefulness of spatially organized symbols is particularly evident. External representations and processes can enhance internal representations and (...)
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  3.  1
    Artif. Intell.Christian Freksa - 1996 - Artificial Intelligence 87 (1-2):387.
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