@article{CMUC_1991__32_4_a1,
     author = {Gardner, B. J.},
     title = {Radicals which define factorization systems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {601--607},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {1991},
     mrnumber = {1159806},
     zbl = {0752.16009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1991__32_4_a1/}
}