1. Y. Iwasa, p. 1205 in “Advances in Superconductivity V,” Springer-Verlag, Tokyo (1992).
2. H. Mukai, K. Ohkura, N. Shibuta, T. Hikata, M. Ueyama, T. Kato, J. Fujikami, K. Munakata, and K. Sato, p. 679 in “Advances in Superconductivity V,” Springer-Verlag, Tokyo (1992).
3. J. Kase, K. Togano, H. Kumakura, D.R. Dieterich, N. Irisawa, T. Morimoto, and H. Maeda, Jap. J. App!. Phys. 29: L1096 (1990).
4. K. Togano, H. Kumakura, K. Kadowaki, H. Kitaguchi, H. Maeda, J. Kase, J. Shimoyama, and K. Nomura, Adv. Cryog. Eng. 38B: 1081 (1992).
5. S. Hayashi, K. Shibutani, T. Ergi, I. Shigaki, R. Ogawa, Y. Kawate, and P. Lambert, p. 49 in “Proceedings of the 5th U.S.-Japan Workshop on High-T. Superconductors,” Tsukuba, Japan (1992).