@article{CMUC_1960_1_3_a1,
     author = {Jerison, Meyer},
     title = {A note on perfectly normal spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {16--17},
     year = {1960},
     volume = {1},
     number = {3},
     zbl = {0096.17003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1960_1_3_a1/}
}