@article{CMUC_1960__1_1_a0, author = {\v{C}ech, Eduard}, title = {Propri\'et\'es projectives du contact. {III}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {1--19}, publisher = {mathdoc}, volume = {01}, number = {1}, year = {1960}, zbl = {0116.13801}, language = {fr}, url = {http://geodesic.mathdoc.fr/item/CMUC_1960__1_1_a0/} }