@article{2978, author = {Karnik, S.M.}, title = {On maps of spaces determined by countable subspaces}, journal = {Portugaliae mathematica}, volume = {40}, year = {1981}, pages = {405-412}, zbl = {0594.54010}, mrnumber = {0836102}, language = {en}, url = {http://dml.mathdoc.fr/item/2978} }
Karnik, S.M. On maps of spaces determined by countable subspaces. Portugaliae mathematica, Tome 40 (1981) pp. 405-412. http://gdmltest.u-ga.fr/item/2978/