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@article{IVM_1974_5_a26, author = {L. N. Shevrin}, title = {On the theory of periodic semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {205--215}, publisher = {mathdoc}, number = {5}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1974_5_a26/} }
L. N. Shevrin. On the theory of periodic semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1974), pp. 205-215. http://geodesic.mathdoc.fr/item/IVM_1974_5_a26/