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References:
[ML] J. MLČEK: Approximations of $\sigma $-classes and $\pi $-classes. Comment. Math. Univ. Carolinae 20 (1979), 669-679. MR 0555182
[M2] J. MLČEK: Valuations of structures. Comment. Math. Univ. Carolinae 20 (1979), 681-695. MR 0555183
[V] P. VOPĚNKA: Mathematics in the alternative set theory. Teubner-Texte, Leipzig, 1979. MR 0581368
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