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[K] J. L. KELLEY: General Topology. Van Norstad Comp., Inc., 1961. MR 0070144
[Ml] J. MLČEK: Approximation of $\sigma $-classes and $\pi $-classes. Comment. Math. Univ. Carolinae 20 (1979), 669-679. MR 0555182
[S-V 2] A. SOCHOR P. VOPĚNKA: Revealments. to appear in Comment. Math. Univ. Carolinae 21 (1980). MR 0566243
[V] P. VOPĚNKA: Mathematics in the alternative set theory. Teubner-Texte, Leipzig 1979. MR 0581368
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