@book{ BA01337455,
 author = "Baeten, J. C. M.",
 title = "Filters and ultrafilters over definable subsets of admissible ordinals",
 publisher = "Centrum voor Wiskunde en Informatica",
 year = "1986",
 series = "CWI tract",
 number = "24",
 URL = "https://ci.nii.ac.jp/ncid/BA01337455"
}
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