@article{Poon1993,
	title = {Analysis of structural equation models with interval and polytomous
	data},
	author = {Wai-Yin Poon and Yin-Ping Leung},
	day = {26},
	journal = {Statistics \& Probability Letters},
	month = {May},
	number = {2},
	pages = {127--137},
	url = {http://www.sciencedirect.com/science/article/B6V1D-45D9T8K-7/1/2e5b2271d91c6d63dd7f881f7b276ccc},
	volume = {17},
	year = {1993},
	biburl = {http://www.bibsonomy.org/bibtex/26a94a0d5aeb8264e1df7aa41dd8a13b8/smicha},
	keywords = {Structural equation models }
}