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@article{AL_1967_6_5_a0, author = {Yu. L. Ershov}, title = {Elementary theories of {Post} varieties}, journal = {Algebra i logika}, pages = {7--15}, publisher = {mathdoc}, volume = {6}, number = {5}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1967_6_5_a0/} }
Yu. L. Ershov. Elementary theories of Post varieties. Algebra i logika, Tome 6 (1967) no. 5, pp. 7-15. http://geodesic.mathdoc.fr/item/AL_1967_6_5_a0/