TY  - JOUR
AU  - S. D. Denisov
TI  - Three theorems on elementary theories and $tt$-reducibility
JO  - Algebra i logika
PY  - 1974
SP  - 5
EP  - 8
VL  - 13
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1974_13_1_a0/
LA  - ru
ID  - AL_1974_13_1_a0
ER  -