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@article{DAN_1977_232_5_a8, author = {D. V. Ranchin}, title = {Tightness, sequentiality and closed coverings}, journal = {Doklady Akademii Nauk}, pages = {1015--1018}, publisher = {mathdoc}, volume = {232}, number = {5}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a8/} }
D. V. Ranchin. Tightness, sequentiality and closed coverings. Doklady Akademii Nauk, Tome 232 (1977) no. 5, pp. 1015-1018. http://geodesic.mathdoc.fr/item/DAN_1977_232_5_a8/