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@article{DAN_1970_191_3_a8, author = {S. Sirota}, title = {On the problem of the classification of filters}, journal = {Doklady Akademii Nauk}, pages = {533--536}, publisher = {mathdoc}, volume = {191}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_3_a8/} }
S. Sirota. On the problem of the classification of filters. Doklady Akademii Nauk, Tome 191 (1970) no. 3, pp. 533-536. http://geodesic.mathdoc.fr/item/DAN_1970_191_3_a8/