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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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  • On redundant topological constraints.Sanjiang Li, Zhiguo Long, Weiming Liu, Matt Duckham & Alan Both - 2015 - Artificial Intelligence 225 (C):51-76.
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