@article{PIM_1978_N_S_24_38_a9,
     author = {Aleksandar Jovanovi\'c},
     title = {A {Note} {On} {Ultrapower} {Cardinality}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {79 },
     publisher = {mathdoc},
     volume = {_N_S_24},
     number = {38},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/PIM_1978_N_S_24_38_a9/}
}