@article{SM_1981_40_4_a6,
     author = {A. I. Budkin},
     title = {The axiomatic rank of a~quasivariety containing a~free solvable group},
     journal = {Sbornik. Mathematics},
     pages = {583--590},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_40_4_a6/}
}