@article {49836,
	title = {Estimating Tree-Structured Covariance Matrices via Mixed-Integer Programming},
	journal = {J Mach Learn Res},
	volume = {5},
	year = {2009},
	pages = {41-48},
	chapter = {41},
	author = {Corrada Bravo, Hector and Wright, Stephen and Eng, Kevin H. and Keles, S{\"u}nd{\"u}z and Wahba, Grace}
}
