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@article{PORMA_1981__40_4_115468, author = {Karnik, S.M.}, title = {On maps of spaces determined by countable subspaces}, journal = {Portugaliae mathematica}, pages = {405--412}, publisher = {mathdoc}, volume = {40}, number = {4}, year = {1981}, mrnumber = {0836102}, zbl = {0594.54010}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115468/} }
Karnik, S.M. On maps of spaces determined by countable subspaces. Portugaliae mathematica, Tome 40 (1981) no. 4, pp. 405-412. http://geodesic.mathdoc.fr/item/PORMA_1981__40_4_115468/