Caroline Essert-Villard Pascal Schreck Jean-François Dufourd Sketch-based pruning of a solution space within a formal geometric constraint solver. 139-159 2000 124 Artif. Intell. 1 db/journals/ai/ai124.html#Essert-VillardSD00 http://dx.doi.org/10.1016/S0004-3702(00)00061-8