MathSciNet bibliographic data MR269508 (42 #4403) 02.77 Jockusch, C. G., Jr.; McLaughlin, T. G. Countable retracing functions and \$\Pi \sb{2}{}\sp{0}\$$\Pi \sb{2}{}\sp{0}$ predicates. Pacific J. Math. 30 1969 67–93. Article

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