1. Morita, M., Miyamoto, K., Doi, K., Murakami, M., Sawano, K., and Matsuda, S.: Physica, C172(1990), 383.
2. Morita, M., Takebayashi, S., Tanaka, M., Kimura, K., Miyamoto, K., and Sawano, K.: Advances in Superconductivity III, Springer-Verlag, Tokyo, (1990), p. 733.
3. Kimura, K., Morita, M., Tanaka. M., Takebayashi, S., Trouilleux, L., Miyamoto, K., Hashimoto, M., Watanabe, K., Awaji, S., and Kobayashi, N.: Cryogenics, 33(1993), 506.
4. Salama, K., and Selvamanickam, V.,: Appl. Phys. Lett., 60(1992), 898.
5. Matsushita, T., Ni, B., Yamafuji, K., Watanabe, K., Noto, K., Morita, H., Fujimori, H., and Muto, Y.: Advances in Superconductivity, Springer-Verlag, Tokyo, (1988), p. 393.