@article {47077,
	title = {Heavy oil and oil (tar) sands in North America: an overview \& summary contributions},
	volume = {15},
	year = {2006},
	pages = {67-84},
	publisher = {Natural Resources Research},
	url = {http://www.springerlink.com/content/6015709q6132178h/fulltext.pdf},
	author = {Hein, Frances J.}
}
