@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/}
}