1. ARRHENIUS, G., and E. BONNATTI (1964): Neptunism and vulcanism in the ocean. Progress in Oceangraphy (Pettersson Volume), 3, 7-22.
2. BLACK, W. A. P., and R. L. MITCHELL (1952): Trace elements in the common brown algae and sea water. J. Mar. Biol. Ass., U. K., 30, 575-584.
3. CHUECAS, L., and J. P. RILEY (1966): The spectrophotometric determination of chromium in sea water. Anal. Chim. Acta, 35, 240-246. C
4. CUTSHALL, N., V. JOHNSON and C. OSTERBERG (1966): Chromium-51 in sea water: Chemistry. Science, 152 (3719), 202-203.
5. DUURSMA, E. K. (1967): A simple, horizontally hauled large volume water-sampling bottle of Van Dorn type, Deep-Sea Res., 14, 133-134.