Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1967__171_161567, author = {CH. EHRESMANN}, title = {Structures {Quasi-Quotient.}}, journal = {Mathematische Annalen}, pages = {293--364}, publisher = {mathdoc}, volume = {171}, year = {1967}, zbl = {0248.18007}, url = {http://geodesic.mathdoc.fr/item/MAN_1967__171_161567/} }
CH. EHRESMANN. Structures Quasi-Quotient.. Mathematische Annalen, Tome 171 (1967), pp. 293-364. http://geodesic.mathdoc.fr/item/MAN_1967__171_161567/