@article {20710,
	title = {The application of Positive Matrix Factorization (PMF) to eco-efficiency analysis},
	journal = {Journal of Environmental Management},
	volume = {98},
	year = {2012},
	note = {Times Cited: 7271095-8630},
	month = {May},
	pages = {11-14},
	isbn = {0301-4797},
	author = {Wu, Jiaying and Zhijun Wu and Hollaender, Robert}
}
