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• Volume 22

Author: Vopěnka, Petr

• Sochor, Antonín; Vopěnka, Petr: The axiom of reflection. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 1, pp. 87-111
• Sochor, Antonín; Vopěnka, Petr: Ultrafilters of sets. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 4, pp. 689-699