@article{AL_1994_33_1_a1,
     author = {A. I. Budkin},
     title = {Lattice of quasivarieties of nilpotent groups},
     journal = {Algebra i logika},
     pages = {25--36},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1994_33_1_a1/}
}