@article{CTGDC_1967__9_1_1_0,
     author = {Ehresmann, Charles},
     title = {Propri\'et\'es infinit\'esimales des cat\'egories diff\'erentiables},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {1--9},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {9},
     number = {1},
     year = {1967},
     mrnumber = {244336},
     zbl = {0192.10103},
     language = {fr},
     url = {http://archive.numdam.org/item/CTGDC_1967__9_1_1_0/}
}