@article {33372,
	title = {Chemical structure of tar-sand bitumens by 13C and 1H n.m.r. spectroscopic methods},
	volume = {61},
	year = {1982},
	pages = {402-410},
	publisher = {Fuel},
	author = {Suzuki, T. and Itoh, M. and Takegami, Y. and Watanabe, Y.}
}
