1. Kai, K., Misawa, M., Watanabe, N., Takeuchi, S., Kimura, M.: Res. Rep. Laboratory Nuclear Sci. Tohoku University,5, 77 (1972)
2. Glazov, V. M., Chizhevskaya, S. N.: Liquid Semiconductors. New York: Wiley 1969
3. Waseda, Y., Moriya, K.: Bull. Res. Instr. Mineral Dressing and Metallurgy. Tohoku University,29, 135 (1973)
4. Waseda, Y., Takahashi, F., Suzuki, K.: Sci. Rep. Res. Instr. Tohoku University,23A, 127 (1971)
5. Waseda, Y., Yokoyama, K., Suzuki, K.: Phil. mag.29, 1427 (1974)