A Note on the Hyperarithmetical Hierarchy. Enderton, H. B. & Putnam, H. J. Symb. Log., 35(3):429-430, 1970.
A Note on the Hyperarithmetical Hierarchy. [link]Link  A Note on the Hyperarithmetical Hierarchy. [link]Paper  bibtex   
@article{journals/jsyml/EndertonP70,
  added-at = {2014-08-05T00:00:00.000+0200},
  author = {Enderton, Herbert B. and Putnam, Hilary},
  biburl = {https://www.bibsonomy.org/bibtex/250b1157a9d2cdeefcd5ae64cbaa6ce6e/dblp},
  ee = {http://projecteuclid.org/euclid.jsl/1183737266},
  interhash = {75f4fca242a0ad80b2dd096a26449327},
  intrahash = {50b1157a9d2cdeefcd5ae64cbaa6ce6e},
  journal = {J. Symb. Log.},
  keywords = {dblp},
  number = 3,
  pages = {429-430},
  timestamp = {2015-06-18T02:24:03.000+0200},
  title = {A Note on the Hyperarithmetical Hierarchy.},
  url = {http://dblp.uni-trier.de/db/journals/jsyml/jsyml35.html#EndertonP70},
  volume = 35,
  year = 1970
}

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