@article{oai:tsukuba.repo.nii.ac.jp:00017122,
 author = {Abe, Yoshihiro and Shioya, Masahiro},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {31--37},
 title = {Regularity of ultrafilters and fixed points of elementary embeddings},
 volume = {22},
 year = {1998}
}