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@article{AL_1968_7_6_a1, author = {V. M. Kopytov}, title = {The solvability of the occurrence problem in finitely generated}, journal = {Algebra i logika}, pages = {53--63}, publisher = {mathdoc}, volume = {7}, number = {6}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1968_7_6_a1/} }
V. M. Kopytov. The solvability of the occurrence problem in finitely generated. Algebra i logika, Tome 7 (1968) no. 6, pp. 53-63. http://geodesic.mathdoc.fr/item/AL_1968_7_6_a1/