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[Č] E. ČECH: Topological spaces. Academia, Praha 1965.
[F1] Z. FROLÍK: Sums of ultrafilters. Bull. Amer. Math. Soc. 73 (1967), 87-91. MR 0203676
[F2] Z. FROLÍK: Types of ultrafilters on countable sets. Proc. Second Prague Symposium on Topology, pp. 142-3, Academia, Praha 1967.
[F3] Z. FROLÍK: Fixed points of maps of $\beta M$. To appear in Bull. Amer. Math. Soc. MR 0222847
[F4] Z. FROLÍK: Fixed points of maps of extremally disconnected spaces and Boolean Algebras. Submitted to Bull. Acad. Polon.
[R] W. RUDIN: Homogeneity problems in the theory of Čech compactifications. Duke Math. J. 23 (156), pp. 409-19, 633. MR 0080902 | Zbl 0073.39602
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