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@article{DAN_1972_207_5_a11, author = {V. L. Timokhovich}, title = {On spaces with $\omega$-systems}, journal = {Doklady Akademii Nauk}, pages = {1060--1062}, publisher = {mathdoc}, volume = {207}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a11/} }
V. L. Timokhovich. On spaces with $\omega$-systems. Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1060-1062. http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a11/