1. Methods of Testing Salts, Soc. Sea Water Sci. Japan, Tokyo, 1997 (in Japanese).
2. T. Oi, K. Ogiwara, M. Yui, T. Ossaka, M. Mukaida, T. Honda, Bull. Soc. Sea Water Sci. Japan, 49 (1995) 27 (in Japanese).
3. T. Honda, T. Oi, T. Ossaka, T. Nozaki, H. Kakihana, J. Radioanal. Nucl. Chem., 130 (1989) 81.
4. H. Gies, Scientific Basis for Radioactive Waste Management-V,L. Werner (Ed.), Elsevier, Amsterdam, 1982, p. 459.
5. H. Gotoh, Y. Takita, T. Furukawa, Nihon Kagakukai Shi, 79 (1958) 1513 (in Japanese).