TY - JOUR AU - M. G. Peretyat'kin TI - A theory with three countable models JO - Algebra i logika PY - 1980 SP - 224 EP - 235 VL - 19 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1980_19_2_a5/ LA - ru ID - AL_1980_19_2_a5 ER -