@article{RCM_1977__11_181660,
     author = {Roberto Ruiz},
     title = {The closure of a model category},
     journal = {Revista colombiana de matematicas},
     pages = {19--50},
     publisher = {mathdoc},
     volume = {11},
     year = {1977},
     zbl = {0393.18001},
     url = {http://geodesic.mathdoc.fr/item/RCM_1977__11_181660/}
}