A new approach to cyclic ordering of 2D orientations using ternary relation algebras.

Amar Isli Anthony G. Cohn A new approach to cyclic ordering of 2D orientations using ternary relation algebras. 137-187 2000 122 Artif. Intell. 1-2 db/journals/ai/ai122.html#IsliC00 http://dx.doi.org/10.1016/S0004-3702(00)00044-8