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  1. 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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  • Qualitative constraint satisfaction problems: An extended framework with landmarks.Sanjiang Li, Weiming Liu & Shengsheng Wang - 2013 - Artificial Intelligence 201 (C):32-58.
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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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