Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1963__38_139275, author = {Charles Ehresmann}, title = {Structures quotient.}, journal = {Commentarii mathematici Helvetici}, pages = {219--283}, publisher = {mathdoc}, volume = {38}, year = {1963}, url = {http://geodesic.mathdoc.fr/item/CMH_1963__38_139275/} }
Charles Ehresmann. Structures quotient.. Commentarii mathematici Helvetici, Tome 38 (1963), pp. 219-283. http://geodesic.mathdoc.fr/item/CMH_1963__38_139275/