Recursively Enumerable Classes and Their Application to Recursive Sequences of Formal Theories.by Marian Boykan Pour-El; Hilary Putnam;A Structural Criterion for Recursive Enumeration Without Repetition.by Marian Boykan Pour-El; William A. Howard;On Recursive Enumeration without Repetition.by A. H. Lachlan;On Recursive Enumeration without Repetition: a Correction.by A. H. Lachlan

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