1. Merrihue, C. Ann. N.Y. Acad. Sci. 119, 351–367 (1964).
2. Krylov, A. Ya., Mamyrin, B. A., Silin, Yu. I. & Khabarin, L. V. Geochem. Int. 10, 202–205 (1973).
3. Tilles, D. Science 153, 981–984 (1966).
4. Ozima, M., Takayanagi, M., Zashu, S. & Amari, S. Nature 311, 448–450 (1984).
5. Kobayashi, K., Tonouchi, S., Furuta, T. & Watanabe, M. Bull. Ocean Res. Inst. 13, 116–121 (1980).