@article{JMPA_1937_9_16_1-4_69_0, author = {Ehresmann, Charles}, title = {Sur la topologie de certaines vari\'et\'es alg\'ebriques r\'eelles}, journal = {Journal de Math\'ematiques Pures et Appliqu\'ees}, pages = {69--100}, publisher = {Gauthier-Villars}, volume = {9e s{\'e}rie, 16}, number = {1-4}, year = {1937}, zbl = {0016.07403}, language = {fr}, url = {http://archive.numdam.org/item/JMPA_1937_9_16_1-4_69_0/} }