@article{AMLG_1974__16_137883,
     author = {Klaus Potthoff},
     title = {Boolean {Ultrapowers.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {37--48},
     publisher = {mathdoc},
     volume = {16},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1974__16_137883/}
}