@article{JRAM_1972__253_151205,
     author = {Klaus Kopfermann},
     title = {Ultraprodukte endlicher {K\"orper.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {138--140},
     year = {1972},
     volume = {253},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__253_151205/}
}