Woodhouse, O. B., Ravizza, G., Kenison Falkner, K., Statham, P. J., and B. Peucker-Ehrenbrink., 1999. Earth. Planet. Sci. Lett. 173: 223-233.
Atlantic and Pacific:
Sharma, M., Papanastassiou, D. A., and Wasserburg, G. J., 1997. The concentration and isotopic composition of osmium in the oceans. Geochim. Cosmochim. Acta 61: 3287-3299.
Indian:
Levasseur, S., Birck, J.-L., and Allegre, C. J., 1998. Direct measurement of femtomoles of osmium and the 187Os/186Os ratio in seawater. Science 282: 272-274.