1. N. MIZOGUCHI, T. FUJINO, Y. YANO, Balneolgical Survey Report, 24 (1973) 88, Ohita Prefecture, Japan (unpublished). N. SHIGA, T. KAWANO, H. HIROTA, Balneological Survey Report 24 (1973) 82, Ohita Prefecture, Japan (unpublished).
2. H. NAKAHARA, M. YANOKURA, Y. MURAKAMI, J. Radioanal Chem., 37 (1977) 839.
3. T. YAMAZAKI, Y. MATSUMOTO, Mem. Inst. Ind. Sci., Univ. Kyushu, 44 (1967) 47, (unpublished).
4. T. MASUDA, Japan, Geothermal Energy Assoc., Tokyo, Japan, 14 (1968) 77.
5. T. NODA, A. KOGA, Balneolgical Survey Report, 24 (1973) 64, Ohita Prefecture, Japan (unpublished).