On degrees of unsolvability. Shoenfield, J. Ann. of Math., 69(2):644-653, 1959.
bibtex   
@ARTICLE{Sho59,
  author = {Shoenfield, J.R.},
  title = {On degrees of unsolvability},
  journal = {Ann. of Math.},
  year = {1959},
  volume = {69},
  pages = {644-653},
  number = {2},
  file = {Sho59.pdf:Sho59.pdf:PDF},
  keywords = {bib}
}

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