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@article{AL_1997_36_5_a1, author = {V. G. Bardakov}, title = {On the width of verbal subgroups of some free constructions}, journal = {Algebra i logika}, pages = {494--517}, publisher = {mathdoc}, volume = {36}, number = {5}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1997_36_5_a1/} }
V. G. Bardakov. On the width of verbal subgroups of some free constructions. Algebra i logika, Tome 36 (1997) no. 5, pp. 494-517. http://geodesic.mathdoc.fr/item/AL_1997_36_5_a1/