@article{IVM_1989_6_a3,
     author = {M. V. Volkov},
     title = {Semigroup varieties with a~modular lattice of subvarieties},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {51--60},
     publisher = {mathdoc},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_6_a3/}
}