Degrees of members of $Π \sp{0}\sb{1}$ classes. Jockusch & Soare, R. I. Pacific Journal of Mathematics, 40:605–616, 1972.
bibtex   
@ARTICLE{JS72a,
  author = {Jockusch, Jr., Carl G. and Soare, Robert I.},
  title = {Degrees of members of {$\Pi \sp{0}\sb{1}$} classes},
  journal = {Pacific Journal of Mathematics},
  year = {1972},
  volume = {40},
  pages = {605--616},
  file = {JS72a.pdf:JS72a.pdf:PDF},
  keywords = {rec}
}

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