@ARTICLE{Fri57,
  author = {Friedberg, Richard},
  title = {A criterion for completeness of degrees of unsolvability},
  journal = {J. Symb. Logic},
  year = {1957},
  volume = {22},
  pages = {159--160},
  doi = {10.2307/2964177},
  file = {Fri57.pdf:Fri57.pdf:PDF},
  fjournal = {The Journal of Symbolic Logic},
  issn = {0022-4812},
  mrclass = {02.00},
  mrnumber = {0098025 (20 \#4488)},
  mrreviewer = {G. F. Rose},
  url = {http://www.jstor.org/stable/2964177}
}

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