@article{Poon1992,
	title = {Maximum likelihood and generalized least squares analyses of two-level
	structural equation models},
	author = {Wai-Yin Poon and Sik-Yum Lee},
	day = {04},
	journal = {Statistics \& Probability Letters},
	month = {May},
	number = {1},
	pages = {25--30},
	url = {http://www.sciencedirect.com/science/article/B6V1D-45DHJ51-18/1/2102b038197a774925e8bcf40bfc0f05},
	volume = {14},
	year = {1992},
	biburl = {http://www.bibsonomy.org/bibtex/2b28ecc8bfd57f4629b955fd40eb60083/smicha},
	keywords = {Two-level equation models structural }
}