1. Lal, D. Science 198, 997–1009 (1977).
2. Parker, P. L. & Calder, J. A. in Organic Matter in Natural Waters (ed. Hood, D. W.) 107–127 (Institute of Marine Science, University of Alaska, 1970).
3. McCave, I. N. Deep-Sea Res. 22, 491–502 (1975).
4. Williams, P. M. & Gordon, L. I. Deep-Sea Res. 17, 19–27 (1970).
5. Eadie, B. J. & Jeffrey, L. M. Mar. Chem. 1, 199–209 (1973).