@mastersthesis {37417,
	title = {Effects of reservoir heterogeneities on heavy oil recovery by steam-assisted gravity drainage},
	year = {1990},
	pages = {140},
	address = {University of Calgary},
	keywords = {oil extraction, SAGD},
	url = {http://search.proquest.com/docview/303802971},
	author = {Yang, Guihua (Peter)}
}
