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@article{IM2_1971_5_6_a4, author = {Yu. I. Khmelevskii}, title = {Systems of equations in a~free {group.~I}}, journal = {Izvestiya. Mathematics }, pages = {1245--1276}, publisher = {mathdoc}, volume = {5}, number = {6}, year = {1971}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_6_a4/} }
Yu. I. Khmelevskii. Systems of equations in a~free group.~I. Izvestiya. Mathematics , Tome 5 (1971) no. 6, pp. 1245-1276. http://geodesic.mathdoc.fr/item/IM2_1971_5_6_a4/