@article{PIM_1986_N_S_39_53_a3,
     author = {Aleksandar Ignjatovi\'c},
     title = {Unions and {Intersections} of {Isomoryhic} {Images} of {Nonstandard} {Models} of {Arithmetic}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {25 },
     publisher = {mathdoc},
     volume = {_N_S_39},
     number = {53},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1986_N_S_39_53_a3/}
}