@article {26738,
	title = {Petroleum pigments from recent fresh-water sediments},
	volume = {19},
	year = {1960},
	pages = {272-288},
	publisher = {Geochimica et Cosmochimica Acta},
	url = {http://article.pubs.nrc-cnrc.gc.ca/ppv/RPViewDoc?issn=0831-2796\&volume=45\&issue=3\&startPage=530},
	author = {Hodgson, G. W. and Hitchon, B. and Elofson, R. M. and Baker, B. l. and Peake, E.}
}
