@article{AL_2021_60_2_a0,
     author = {A. I. Budkin},
     title = {Independent axiomatizability of quasivarieties of torsion-free nilpotent groups},
     journal = {Algebra i logika},
     pages = {123--136},
     publisher = {mathdoc},
     volume = {60},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2021_60_2_a0/}
}