@article{100340, author = {Zden\v ek Frol\'\i k}, title = {On $G\_\delta$-spaces}, journal = {Czechoslovak Mathematical Journal}, volume = {09}, year = {1959}, pages = {63-65}, zbl = {0084.38201}, mrnumber = {0112116}, language = {en}, url = {http://dml.mathdoc.fr/item/100340} }
Frolík, Zdeněk. On $G_\delta$-spaces. Czechoslovak Mathematical Journal, Tome 09 (1959) pp. 63-65. http://gdmltest.u-ga.fr/item/100340/