Extensions of Pure States. Kadison, R. V. & Singer, I. M. American Journal of Mathematics, 81(2):383, April, 1959.
Extensions of Pure States [link]Paper  doi  bibtex   
@article{kadison_extensions_1959,
	title = {Extensions of {Pure} {States}},
	volume = {81},
	issn = {00029327},
	url = {http://www.jstor.org/stable/2372748?origin=crossref},
	doi = {10.2307/2372748},
	number = {2},
	urldate = {2016-07-16},
	journal = {American Journal of Mathematics},
	author = {Kadison, Richard V. and Singer, I. M.},
	month = apr,
	year = {1959},
	pages = {383},
}

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