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@article{FPM_1996_2_1_a20, author = {U. U. Umirbaev}, title = {On ranks of elements of free groups}, journal = {Fundamentalʹna\^a i prikladna\^a matematika}, pages = {313--315}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FPM_1996_2_1_a20/} }
U. U. Umirbaev. On ranks of elements of free groups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 2 (1996) no. 1, pp. 313-315. http://geodesic.mathdoc.fr/item/FPM_1996_2_1_a20/