Krammer, R, Baumann, KH and Henrich, R (2006) Middle to Late Miocene fluctuations in the incipient Benguela Upwelling System revealed by calcareous nannofossil assemblages (ODP Site 1085A). Palaeogeography, Palaeoclimatology, Palaeoecology, 230(3-4). 319-334. doi:10.1016/j.palaeo.2005.07.022