@article{ARM_1986_22_4_a0,
     author = {Brunner, Norbert},
     title = {Ultraproducts and the axiom of choice},
     journal = {Archivum mathematicum},
     pages = {175--180},
     year = {1986},
     volume = {22},
     number = {4},
     mrnumber = {868531},
     zbl = {0642.03029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1986_22_4_a0/}
}