Lal, D.; Charles, C.; Vacher, L.; Goswami, J. N.; Jull, A. J. T.; McHargue, L.; Finkel, R. C. (2006): Paleo-ocean chemistry records in marine opal; implications for fluxes of trace elements, cosmogenic nuclides ( (super 10) Be and (super 26) Al), and biological productivity. Elsevier, New York, NY, International, Geochimica et Cosmochimica Acta, 70 (13), 3275-3289, georefid:2008-044066