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  1. (1 other version)On the Sources of Knowledge and of Ignorance.Karl R. Popper - 1962 - Philosophy and Phenomenological Research 23 (2):292-293.
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  • (1 other version)On the sources of knowledge and ignorance;(J. Kucera: Commentary).K. R. Popper - 2001 - Filosoficky Casopis 49 (6):969-985.
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