%0 Journal Article %A Hájek, Petr %T Completion closed algebras and models of Peano arithmetic %J Commentationes Mathematicae Universitatis Carolinae %D 1981 %P 585-594 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1981__22_3_a12/ %G en %F CMUC_1981__22_3_a12