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  1. Concerning formulas of the types a →b ∨c, a →(ex)b(X).Ronald Harrop - 1960 - Journal of Symbolic Logic 25 (1):27-32.
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  • A formulation of the simple theory of types.Alonzo Church - 1940 - Journal of Symbolic Logic 5 (2):56-68.
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  • Investigations into Logical Deduction.Gerhard Gentzen - 1964 - American Philosophical Quarterly 1 (4):288 - 306.
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  • Metamathematical investigation of intuitionistic arithmetic and analysis.Anne S. Troelstra - 1973 - New York,: Springer.
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