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@article{AL_1971_10_2_a2, author = {V. M. Kopytov}, title = {Solvability of the occurrence problem in finitely generated}, journal = {Algebra i logika}, pages = {169--182}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1971_10_2_a2/} }
V. M. Kopytov. Solvability of the occurrence problem in finitely generated. Algebra i logika, Tome 10 (1971) no. 2, pp. 169-182. http://geodesic.mathdoc.fr/item/AL_1971_10_2_a2/