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@article{DAN_1970_193_5_a11, author = {S. A. Rusakov}, title = {A generalization of {Post's} theorem}, journal = {Doklady Akademii Nauk}, pages = {1008--1011}, publisher = {mathdoc}, volume = {193}, number = {5}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a11/} }
S. A. Rusakov. A generalization of Post's theorem. Doklady Akademii Nauk, Tome 193 (1970) no. 5, pp. 1008-1011. http://geodesic.mathdoc.fr/item/DAN_1970_193_5_a11/