The cofinality of the symmetric group and the cofinality of ultrapowers. Mildenberger, H. & Shelah, S.
bibtex   
@article{MdSh:1021,
author = {Mildenberger, Heike and Shelah, Saharon},
trueauthor = {Mildenberger, Heike and Shelah, Saharon},
fromwhere = {D,IL},
title = {{The cofinality of the symmetric group and the cofinality
 of	ultrapowers}},
}

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