@article{AMLG_1970__13_137842,
     author = {Halldor Gudj\'onsson},
     title = {Remarks on limitultrapowers.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {154--157},
     year = {1970},
     volume = {13},
     zbl = {0217.30403},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1970__13_137842/}
}