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@article{GMJ_2002__9_4_50826, author = {Pultr, Ale\v{s} and Tholen, Walter}, title = {Free {Quillen} factorization systems.}, journal = {Georgian Mathematical Journal}, pages = {807--820}, publisher = {mathdoc}, volume = {9}, number = {4}, year = {2002}, zbl = {1041.18002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_2002__9_4_50826/} }
Pultr, Aleš; Tholen, Walter. Free Quillen factorization systems.. Georgian Mathematical Journal, Tome 9 (2002) no. 4, pp. 807-820. http://geodesic.mathdoc.fr/item/GMJ_2002__9_4_50826/