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  1. Effective Operations on Partial Recursive Functions.J. Myhill & J. C. Shepherdson - 1955 - Mathematical Logic Quarterly 1 (4):310-317.
  • A Comparison of Five “Computable” Operators.Marian Boykan Pour-El - 1960 - Mathematical Logic Quarterly 6 (15‐22):325-340.
  • A Comparison of Five “Computable” Operators.Marian Boykan Pour-El - 1960 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 6 (15-22):325-340.
  • Effective Operations on Partial Recursive Functions.J. Myhill & J. C. Shepherdson - 1955 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 1 (4):310-317.