TY - JOUR AU - Hájek, Petr TI - Completion closed algebras and models of Peano arithmetic JO - Commentationes Mathematicae Universitatis Carolinae PY - 1981 SP - 585 EP - 594 VL - 22 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1981__22_3_a12/ LA - en ID - CMUC_1981__22_3_a12 ER -