Shimmield, Graham B. (1992): Can sediment geochemistry record changes in coastal upwelling palaeoproductivity? Evidence from Northwest Africa and the Arabian Sea. Geological Society of London, London, United Kingdom, In: Summerhayes, C. P. (editor), Prell, Warren L. (editor), Emeis, Kay-Christian (editor), Upwelling systems; evolution since the early Miocene, 64, 29-46, georefid:2001-063895