%0 Journal Article %A Aleksandar Ignjatović %T Unions and Intersections of Isomoryhic Images of Nonstandard Models of Arithmetic %J Publications de l'Institut Mathématique %D 1986 %P 25 %V _N_S_39 %N 53 %I mathdoc %U http://geodesic.mathdoc.fr/item/PIM_1986_N_S_39_53_a3/ %G en %F PIM_1986_N_S_39_53_a3