TY  - JOUR
AU  - Yu. M. Vazhenin
TI  - Algorithmic problems and hierarchies of first-order languages
JO  - Algebra i logika
PY  - 1987
SP  - 419
EP  - 434
VL  - 26
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1987_26_4_a1/
LA  - ru
ID  - AL_1987_26_4_a1
ER  -