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@article{AL_1969_8_1_a6, author = {A. L. Shmel'kin}, title = {The lower central series of a free product of groups}, journal = {Algebra i logika}, pages = {129--137}, publisher = {mathdoc}, volume = {8}, number = {1}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1969_8_1_a6/} }
A. L. Shmel'kin. The lower central series of a free product of groups. Algebra i logika, Tome 8 (1969) no. 1, pp. 129-137. http://geodesic.mathdoc.fr/item/AL_1969_8_1_a6/