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@article{AL_1973_12_2_a4, author = {G. N. Kobzev}, title = {btt-reducibility.~I}, journal = {Algebra i logika}, pages = {190--204}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1973_12_2_a4/} }
G. N. Kobzev. btt-reducibility.~I. Algebra i logika, Tome 12 (1973) no. 2, pp. 190-204. http://geodesic.mathdoc.fr/item/AL_1973_12_2_a4/