MathSciNet bibliographic data MR316227 (47 #4775) 02F30 (02F35 02G05) Jockusch, Carl G., Jr.; Soare, Robert I. \$\Pi \sp{0}\sb{1}\$$\Pi \sp{0}\sb{1}$ classes and degrees of theories. Trans. Amer. Math. Soc. 173 (1972), 33–56. Article

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