@article {31432,
	title = {Geochemistry and origin of natural heavy-oil deposits, Chapter 2. In : Bitumens, asphalts and tar sands, G. V. Chilingarian and T. F. Yen, editors},
	volume = {Developments in Petroleum Science Volume 7},
	year = {1978},
	pages = {17-25},
	institution = {Elsevier},
	author = {Silverman, S. R.}
}
