@article{SM_1986_53_1_a6,
     author = {Yu. V. Kuz'min},
     title = {The structure of free groups of certain varieties},
     journal = {Sbornik. Mathematics},
     pages = {131--145},
     year = {1986},
     volume = {53},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_53_1_a6/}
}