Blumenberg, M, Mollenhauer, G, Zabel, M, Reimer, A and Thiel, V (2010) Decoupling of bio- and geohopanoids in sediments of the Benguela Upwelling System (BUS). Organic Geochemistry, 41(10). 119-1129. doi:10.1016/j.orggeochem.2010.06.005