@article {35543,
	title = {Nitrogen compounds in Athabasca asphaltene : the carbazoles},
	volume = {3},
	year = {1987},
	pages = {131-138},
	publisher = {AOSTRA Journal of Research},
	author = {Frakman, Z. and Ignasiak, T. M. and Montgomery, D. S. and Strausz, O. P.}
}
