@article{AL_1982_21_2_a4,
     author = {A. V. Iltyakov},
     title = {Lattice of subvarieties of a variety of two-step solvable},
     journal = {Algebra i logika},
     pages = {170--177},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1982_21_2_a4/}
}