TY - JOUR AU - Aleksandar Ignjatović TI - Unions and Intersections of Isomoryhic Images of Nonstandard Models of Arithmetic JO - Publications de l'Institut Mathématique PY - 1986 SP - 25 VL - _N_S_39 IS - 53 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PIM_1986_N_S_39_53_a3/ LA - en ID - PIM_1986_N_S_39_53_a3 ER -