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@article{10_4064_cm_2_1_30_33, author = {Miroslav Kat\v{e}tov}, title = {On mapping of countable spaces}, journal = {Colloquium Mathematicum}, pages = {30--33}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1949}, doi = {10.4064/cm-2-1-30-33}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-2-1-30-33/} }
Miroslav Katětov. On mapping of countable spaces. Colloquium Mathematicum, Tome 2 (1949) no. 1, pp. 30-33. doi : 10.4064/cm-2-1-30-33. http://geodesic.mathdoc.fr/articles/10.4064/cm-2-1-30-33/
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