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@article{IVM_1981_4_a7, author = {M. V. Sapir and E. V. Sukhanov}, title = {Varieties of periodic semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {48--55}, publisher = {mathdoc}, number = {4}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1981_4_a7/} }
M. V. Sapir; E. V. Sukhanov. Varieties of periodic semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1981), pp. 48-55. http://geodesic.mathdoc.fr/item/IVM_1981_4_a7/