TY - JOUR AU - A. V. Gladkii TI - To the editors of ``Algebra and Logic'' JO - Algebra i logika PY - 1967 SP - 113 VL - 6 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1967_6_1_a10/ LA - ru ID - AL_1967_6_1_a10 ER -