@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/}
}