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@article{IM2_1985_25_1_a4, author = {G. S. Makanin}, title = {Decidability of the universal and positive theories of a~free group}, journal = {Izvestiya. Mathematics }, pages = {75--88}, publisher = {mathdoc}, volume = {25}, number = {1}, year = {1985}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1985_25_1_a4/} }
G. S. Makanin. Decidability of the universal and positive theories of a~free group. Izvestiya. Mathematics , Tome 25 (1985) no. 1, pp. 75-88. http://geodesic.mathdoc.fr/item/IM2_1985_25_1_a4/