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  1. Untersuchungen über das logische Schließen. II.Gerhard Gentzen - 1935 - Mathematische Zeitschrift 39:405–431.
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  • (1 other version)Proof Theory and Logical Complexity. [REVIEW]Helmut Pfeifer - 1991 - Annals of Pure and Applied Logic 53 (4):197.
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