The degrees of hyperhyperimmune sets. Jockusch The Journal of Symbolic Logic, 34:489–493, 1969.
bibtex   
@ARTICLE{Joc69,
  author = {Jockusch, Jr., Carl G.},
  title = {The degrees of hyperhyperimmune sets},
  journal = {The Journal of Symbolic Logic},
  year = {1969},
  volume = {34},
  pages = {489--493},
  file = {Joc69.pdf:Joc69.pdf:PDF},
  issn = {0022-4812},
  mrclass = {02.70},
  mrnumber = {0252224 (40 \#5445)},
  mrreviewer = {J. R. Shoenfield}
}

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