@article{IVM_1989_6_a0,
     author = {L. N. Shevrin and E. V. Sukhanov},
     title = {Structural aspects of the theory of varieties of semigroups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--39},
     year = {1989},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_6_a0/}
}