@article{AL_1970_9_6_a0,
     author = {Yu. A. Belov},
     title = {On the question of the lattice of nilpotent varieties of groups of},
     journal = {Algebra i logika},
     pages = {623--628},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1970_9_6_a0/}
}