@article{ARM_2006_42_4_a4,
     author = {Grandis, Marco and Tholen, Walter},
     title = {Natural weak factorization systems},
     journal = {Archivum mathematicum},
     pages = {397--408},
     year = {2006},
     volume = {42},
     number = {4},
     mrnumber = {2283020},
     zbl = {1164.18300},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2006_42_4_a4/}
}