@article {35483,
	title = {Hydrocarbon structural group analysis of Athabasca asphaltene and its n.p.c. fractions by 13 C n.m.r.},
	volume = {66},
	year = {1987},
	pages = {1709-1714},
	publisher = {Fuel},
	author = {Cyr, N. and McIntyre, D. D. and Toth, G. and Strausz, O. P.}
}
