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  1. Qualitative reasoning with directional relations.D. Wolter & J. H. Lee - 2010 - Artificial Intelligence 174 (18):1498-1507.
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  • Reasoning about cardinal directions between extended objects.Weiming Liu, Xiaotong Zhang, Sanjiang Li & Mingsheng Ying - 2010 - Artificial Intelligence 174 (12-13):951-983.
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  • Reasoning about cardinal directions between extended objects: The NP-hardness result.Weiming Liu & Sanjiang Li - 2011 - Artificial Intelligence 175 (18):2155-2169.
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