@article{SE_1964__6__A7_0,
     author = {Kumpera, A.},
     title = {A theorem on {Cartan} pseudogroups},
     journal = {S\'eminaire Ehresmann. Topologie et g\'eom\'etrie diff\'erentielle},
     note = {talk:7},
     pages = {1--12},
     publisher = {Secr\'etariat math\'ematique},
     volume = {6},
     year = {1964},
     mrnumber = {198380},
     zbl = {0161.02602},
     language = {en},
     url = {http://archive.numdam.org/item/SE_1964__6__A7_0/}
}