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  1. The Intrinsic Computational Difficulty of Functions.Alan Cobham - 1965 - In Yehoshua Bar-Hillel (ed.), Logic, methodology and philosophy of science. Amsterdam,: North-Holland Pub. Co.. pp. 24-30.
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  • Some Classes of Recursive Functions.Andrzej Grzegorczyk - 1955 - Journal of Symbolic Logic 20 (1):71-72.
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  • Rekursionszahlen und die Grzegorczyk-Hierarchie.Helmut Schwichtenberg - 1969 - Archive for Mathematical Logic 12 (1-2):85-97.
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  • Classes of Predictably Computable Functions.Robert W. Ritchie - 1963 - Journal of Symbolic Logic 28 (3):252-253.
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