On notation for ordinal numbers. Kleene, S. C. The Journal of Symbolic Logic, 3:150–155, December, 1938.
bibtex   
@Article{JSL:9085488,
		  author   = {Kleene,S. C.},
		    title    = {On notation for ordinal numbers},
			  journal  = {The Journal of Symbolic Logic},
			    year     = {1938},
				  volume   = {3},
				    pages    = {150--155},
					  month    = dec,
					  _bla_doi      = {10.2307/2267778},
					    _bla_issn     = {1943-5886},
						  issue    = {04},
						    numpages = {6},
}

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