Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1964_5_a16, author = {F. I. \v{S}midov}, title = {Countability of a~set}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {115--117}, publisher = {mathdoc}, number = {5}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1964_5_a16/} }
F. I. Šmidov. Countability of a~set. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1964), pp. 115-117. http://geodesic.mathdoc.fr/item/IVM_1964_5_a16/