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@article{AL_1969_8_3_a7, author = {V. G. Sokolov}, title = {An analogue of {Witt's} formula for free solvable groups}, journal = {Algebra i logika}, pages = {367--372}, publisher = {mathdoc}, volume = {8}, number = {3}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1969_8_3_a7/} }
V. G. Sokolov. An analogue of Witt's formula for free solvable groups. Algebra i logika, Tome 8 (1969) no. 3, pp. 367-372. http://geodesic.mathdoc.fr/item/AL_1969_8_3_a7/