@article{VMUMM_1982_2_a2,
     author = {I. Z. Golubchik and A. V. Mikhalev},
     title = {On varieties of algebras with semigroup identity},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {8--11},
     publisher = {mathdoc},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_2_a2/}
}