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@article{AL_1974_13_1_a0, author = {S. D. Denisov}, title = {Three theorems on elementary theories and $tt$-reducibility}, journal = {Algebra i logika}, pages = {5--8}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1974_13_1_a0/} }
S. D. Denisov. Three theorems on elementary theories and $tt$-reducibility. Algebra i logika, Tome 13 (1974) no. 1, pp. 5-8. http://geodesic.mathdoc.fr/item/AL_1974_13_1_a0/