Extensionality and choice in constructive mathematics. Beeson, M. Pacific Journal of Mathematics, 88:1-28, 1980.  bibtex   @article{beeson1980c,
	author = {Michael Beeson},
	date-added = {2014-11-14 21:01:14 +0000},
	date-modified = {2014-11-14 21:02:51 +0000},
	journal = {Pacific Journal of Mathematics},
	keywords = {Logic, Constructive mathematics},
	pages = {1-28},
	title = {Extensionality and choice in constructive mathematics},
	volume = {88},
	year = {1980}} 
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