Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1985_12_a18, author = {M. V. Sapir}, title = {Algorithmic problems in varieties of semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {71--74}, publisher = {mathdoc}, number = {12}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1985_12_a18/} }
M. V. Sapir. Algorithmic problems in varieties of semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1985), pp. 71-74. http://geodesic.mathdoc.fr/item/IVM_1985_12_a18/