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@article{AMLG_1980__20_137957, author = {Joram Hirschfeld}, title = {Generalized ultrapowers.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {13--26}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0453.03032}, url = {http://geodesic.mathdoc.fr/item/AMLG_1980__20_137957/} }
Joram Hirschfeld. Generalized ultrapowers.. Archiv für mathematische Logik und Grundlagenforschung, Tome 20 (1980), pp. 13-26. http://geodesic.mathdoc.fr/item/AMLG_1980__20_137957/