@article{CMUC_1966_7_3_a6,
     author = {H\'ajek, Otomar},
     title = {Notes on quotient maps},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {319--323},
     year = {1966},
     volume = {7},
     number = {3},
     mrnumber = {0202118},
     zbl = {0149.19304},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1966_7_3_a6/}
}