TY  - JOUR
AU  - S. D. Denisov
TI  - Models of a noncontradictory formula and the hierarchy of Er\v{s}ov
JO  - Algebra i logika
PY  - 1972
SP  - 648
EP  - 655
VL  - 11
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1972_11_6_a2/
LA  - ru
ID  - AL_1972_11_6_a2
ER  -