1. G. BERTRAND. On P-simple points, no. 321, C.R Acad’emie des Sciences, 1995. 222, 223, 226
2. T. J. FAN, G. MEDIONI, R. NEVATA. Recognising 3D Objects Using Surface Description, IEEE Trans. Pattern Anal. Mach. Intelligence 11(11),1140–1157, 1989. 222
3. Lect Notes Comput Sci;A. Lenoir,1997
4. A. LENOIR. Des Outils pour les Surfaces Discrètes, PhD Thesis, 1999. 222, 227, 228
5. Lect Notes Comput Sci;R. Malgouyres,1999