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@article{MZM_1967_2_5_a9, author = {A. L. Garkavi and A. M. Flomin}, title = {Approximative properties of sets in certain topological spaces}, journal = {Matemati\v{c}eskie zametki}, pages = {523--530}, publisher = {mathdoc}, volume = {2}, number = {5}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1967_2_5_a9/} }
A. L. Garkavi; A. M. Flomin. Approximative properties of sets in certain topological spaces. Matematičeskie zametki, Tome 2 (1967) no. 5, pp. 523-530. http://geodesic.mathdoc.fr/item/MZM_1967_2_5_a9/