@article{1183524326, author = {S\l owikowski, W.}, title = {Quotient spaces and the open map theorem}, journal = {Bull. Amer. Math. Soc.}, volume = {67}, number = {6}, year = {1961}, pages = { 498-500}, language = {en}, url = {http://dml.mathdoc.fr/item/1183524326} }
Słowikowski, W. Quotient spaces and the open map theorem. Bull. Amer. Math. Soc., Tome 67 (1961) no. 6, pp. 498-500. http://gdmltest.u-ga.fr/item/1183524326/