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[B] D. BOOTH: Ultrafilters on a countable set. Ann. of Math. Logic (1970), 1-24. MR 0277371 | Zbl 0231.02067
[C-N] W. W. COMFORT S. NEGREPONTIS: The theory of Ultrafilters. Springer-Verlag, 1974. MR 0396267
[S-V] A. SOCHOR P. VOPĚNKA: Endomorphic universes and their standard extensions. Comment. Math. Univ. Carolinae 20 (1979), 605-629. MR 0555178
[V] P. VOPĚNKA: Mathematics in the Alternative Set Theory. Teubner-Texte, Leipzig, 1979. MR 0581368
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