Three theorems on elementary theories and $tt$-reducibility
Algebra i logika, Tome 13 (1974) no. 1, pp. 5-8.

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     author = {S. D. Denisov},
     title = {Three theorems on elementary theories and $tt$-reducibility},
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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/