@article{AL_2010_49_5_a0,
     author = {A. I. Budkin},
     title = {Semivarieties of nilpotent groups},
     journal = {Algebra i logika},
     pages = {577--590},
     publisher = {mathdoc},
     volume = {49},
     number = {5},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2010_49_5_a0/}
}