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  1. (1 other version)Undecidable Theories.Alfred Tarski, Andrzej Mostowski & Raphael M. Robinson - 1953 - Philosophy 30 (114):278-279.
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  • (2 other versions)Reflection Principles and their Use for Establishing the Complexity of Axiomatic Systems.G. Kreisel & A. Lévy - 1968 - Mathematical Logic Quarterly 14 (7-12):97-142.
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  • (2 other versions)Reflection Principles and Their Use for Establishing the Complexity of Axiomatic Systems.Georg Kreisel & Azriel Lévy - 1968 - Zeitschrift für Mathematische Logic Und Grundlagen der Mathematik 14 (1):97--142.
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