@article{AL_2003_42_1_a2,
     author = {Ch. K. Gupta and E. I. Timoshenko},
     title = {Test {Rank} for {Some} {Free} {Polynilpotent} {Groups}},
     journal = {Algebra i logika},
     pages = {37--50},
     year = {2003},
     volume = {42},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2003_42_1_a2/}
}