@article{GDZPPN002409402,
title = {Maps and Equivalences into Equalizing Fibrations and from Coequalizing Cofibrations.},
journal = {Mathematische Zeitschrift},
volume = {121},
year = {1971},
pages = {125-141},
zbl = {0207.22301},
url = {http://dml.mathdoc.fr/item/GDZPPN002409402}
}
Rutter, John W. Maps and Equivalences into Equalizing Fibrations and from Coequalizing Cofibrations.. Mathematische Zeitschrift, Tome 121 (1971) pp. 125-141. http://gdmltest.u-ga.fr/item/GDZPPN002409402/