TY - JOUR AU - A. V. Chagrov TI - Varieties of logical matrices JO - Algebra i logika PY - 1985 SP - 426 EP - 489 VL - 24 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1985_24_4_a4/ LA - ru ID - AL_1985_24_4_a4 ER -