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References:
[V] P. VOPĚNKA: Mathematics in the alternative set theory. Teubner-Texte, Leipzig, 1979. MR 0581368
[M] J. MLČEK: Approximation of $\sigma $-classes and $\pi $-classes. Comment. Math. Univ. Carolinae 20 (1979), 669-679. MR 0555182
[S-V] A. SOCHOR P. VOPĚNKA: Revealments. Comment. Math. Univ. Carolinae 21 (1980), 97-118. MR 0566243
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