References
P. Vopěnka,Mathematics in the Alternative Set Theory, Teubnertexte zur Mathematik, Leipzig (1979).
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Translated fromMatematicheskie Zametki, Vol. 61, No. 6, pp. 943–945, June, 1997.
Translated by V. N. Dubrovsky
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Kozlov, S.D., Dronov, S.V. Generators of σ- and π-classes. Math Notes 61, 787–789 (1997). https://doi.org/10.1007/BF02361223
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DOI: https://doi.org/10.1007/BF02361223