@article{FPM_2008_14_8_a2,
     author = {A. V. Grishin},
     title = {On independent systems in unitary relatively free algebras},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {69--71},
     year = {2008},
     volume = {14},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_8_a2/}
}