On notations for ordinal numbers. Kleene, S. C. 3:150–155, 1938.
bibtex   
@ARTICLE{Kle38,
  author = {Kleene, Stephen C.},
  title = {On notations for ordinal numbers},
  journal = JSL,
  year = {1938},
  volume = {3},
  pages = {150--155},
  keywords = {rec}
}

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