TY  - JOUR
AU  - Yu. M. Vazhenin
TI  - Matrix hierarchies of first-order languages and their

JO  - Algebra i logika
PY  - 1991
SP  - 154
EP  - 167
VL  - 30
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_1991_30_2_a1/
LA  - ru
ID  - AL_1991_30_2_a1
ER  -