@article {49482,
	title = {Identification and occurrence of 25-norbenzohopanes in biodegraded bitumen from Palaeozoic carbonates in northern Alberta},
	volume = {40},
	year = {2009},
	pages = {667-670},
	publisher = {Organic Geochemistry},
	url = {http://www.sciencedirect.com/science?_ob=MImg\&_imagekey=B6V7P-4W15KSP-1-7\&_cdi=5848\&_user=1067473\&_orig=search\&_coverDate=06\%2F30\%2F2009\&_sk=999599993\&view=c\&wchp=dGLzVtb-zSkzV\&md5=9ac18fae2846ac776e42aeaea472fb84\&ie=/sdarticle.pdf},
	author = {Bennett, Barry and Jiang, Chunqing and Lartner, Stephen R.}
}
