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@article{DAN_1972_206_2_a0, author = {A. V. Arkhangel'skii}, title = {The frequency spectrum of a topological space and the classification of spaces}, journal = {Doklady Akademii Nauk}, pages = {265--268}, publisher = {mathdoc}, volume = {206}, number = {2}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_2_a0/} }
A. V. Arkhangel'skii. The frequency spectrum of a topological space and the classification of spaces. Doklady Akademii Nauk, Tome 206 (1972) no. 2, pp. 265-268. http://geodesic.mathdoc.fr/item/DAN_1972_206_2_a0/