@article{10_4153_CJM_1972_082_6,
     author = {Adler, Andrew and Jorgensen, Murray},
     title = {Descendingly {Incomplete} {Ultrafilters} and the {Cardinality} of {Ultrapowers}},
     journal = {Canadian journal of mathematics},
     pages = {830--834},
     year = {1972},
     volume = {24},
     number = {5},
     doi = {10.4153/CJM-1972-082-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-082-6/}
}