@article{Yao1996,
	title = {Covariance structure models for clustered proportions},
	author = {Tzy-Jyun Yao and Gregory C. Reinsel},
	day = {15},
	journal = {Statistics \& Probability Letters},
	month = {Aug},
	number = {1},
	pages = {61--70},
	url = {http://www.sciencedirect.com/science/article/B6V1D-3VTJGNR-8/1/dd77e42b6ca926eb22c633502dee822d},
	volume = {29},
	year = {1996},
	biburl = {http://www.bibsonomy.org/bibtex/2dcfdb04ebd33cb084df8316a17a9d336/smicha},
	keywords = {Correlated proportions }
}