@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/}
}