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@article{AL_1968_7_5_a0, author = {L. A. Bokut'}, title = {Degrees of unsolvability of the conjugacy problem for finitely presented groups}, journal = {Algebra i logika}, pages = {4--70}, publisher = {mathdoc}, volume = {7}, number = {5}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1968_7_5_a0/} }
L. A. Bokut'. Degrees of unsolvability of the conjugacy problem for finitely presented groups. Algebra i logika, Tome 7 (1968) no. 5, pp. 4-70. http://geodesic.mathdoc.fr/item/AL_1968_7_5_a0/