@mastersthesis {31769,
	title = {A fluidized bed retort for the extraction of oil from oil sands},
	year = {1979},
	pages = {160},
	address = {University of Calgary},
	keywords = {oil extraction},
	url = {http://search.proquest.com/docview/302909657},
	author = {Trenkwalder, Andreas E.}
}
