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@article{MZ_1971__122_171589, author = {John W. Rutter}, title = {Maps and {Equivalences} into {Equalizing} {Fibrations} and from {Coequalizing} {Cofibrations.}}, journal = {Mathematische Zeitschrift}, pages = {125--141}, publisher = {mathdoc}, volume = {122}, year = {1971}, zbl = {0207.22301}, url = {http://geodesic.mathdoc.fr/item/MZ_1971__122_171589/} }
John W. Rutter. Maps and Equivalences into Equalizing Fibrations and from Coequalizing Cofibrations.. Mathematische Zeitschrift, Tome 122 (1971), pp. 125-141. http://geodesic.mathdoc.fr/item/MZ_1971__122_171589/