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@article{JRAM_1985__358_152717, author = {J.F. Voloch and D. Koutroufiotis}, title = {Saddle surfaces admitting local support planes.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--5}, publisher = {mathdoc}, volume = {358}, year = {1985}, zbl = {0551.53004}, url = {http://geodesic.mathdoc.fr/item/JRAM_1985__358_152717/} }
J.F. Voloch; D. Koutroufiotis. Saddle surfaces admitting local support planes.. Journal für die reine und angewandte Mathematik, Tome 358 (1985), pp. 1-5. http://geodesic.mathdoc.fr/item/JRAM_1985__358_152717/