@article{GDZPPN002298066,
title = {Structures Quasi-Quotient.},
journal = {Mathematische Annalen},
volume = {174},
year = {1967},
pages = {293-364},
zbl = {0248.18007},
url = {http://dml.mathdoc.fr/item/GDZPPN002298066}
}
EHRESMANN, CH. Structures Quasi-Quotient.. Mathematische Annalen, Tome 174 (1967) pp. 293-364. http://gdmltest.u-ga.fr/item/GDZPPN002298066/