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  1. Index Sets Universal for Differences of Arithmetic Sets.Louise Hay - 1974 - Mathematical Logic Quarterly 20 (13‐18):239-254.
  • Index Sets Universal for Differences of Arithmetic Sets.Louise Hay - 1974 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 20 (13-18):239-254.
  • Review: Manuel Blum, On the Size of Machines. [REVIEW]H. B. Enderton - 1972 - Journal of Symbolic Logic 37 (1):199-200.