@book{33287,
	author = {Lott, Juanita Tamayo. and Edmonston, Barry. and National Research Council (U.S.).},
	title = {Spotlight on heterogeneity},
	publisher = {National Academy Press,},
	year = {1996.},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10071421}
}