@article{AL_2001_40_6_a0,
     author = {A. I. Budkin},
     title = {Quasivarieties with {Torsion-Free} {Nilpotent} {Groups}},
     journal = {Algebra i logika},
     pages = {629--650},
     publisher = {mathdoc},
     volume = {40},
     number = {6},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2001_40_6_a0/}
}