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@article{DAN_1987_295_3_a3, author = {A. D. Korshunov}, title = {On the power and structure of some closed {Post} classes (families}, journal = {Doklady Akademii Nauk}, pages = {533--537}, publisher = {mathdoc}, volume = {295}, number = {3}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a3/} }
A. D. Korshunov. On the power and structure of some closed Post classes (families. Doklady Akademii Nauk, Tome 295 (1987) no. 3, pp. 533-537. http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a3/