Paulo E. Santos, Pedro Cabalar. Holes, Knots and Shapes: A Spatial Ontology of a Puzzle. In Logical Formalizations of Commonsense Reasoning, Papers from the 2007 AAAI Spring Symposium, Technical Report SS-07-05, Stanford, California, USA, March 26-28, 2007. pages 144-149, AAAI, 2007. [doi]
Abstract is missing.