1. D. H. Kim, K. E. Gray, R. T. Kampwirth, J. C. Smith, D. S. Richeson, T. J. Marks and M. Eddy, Physica C 177 (1991) 431.
2. T. Doi, M. Okada, A. Soeta, T. Yuasa, K. Aihara, T. Kamo and S. Matsuda, Physica C 183 (1991) 67.
3. T. J. Doi, T. Yuasa, T. Ozawa and K. Higashiyama, Jpn. J. Appl. Phys., 33(1994)5692.
4. T. J. Doi, T. Yuasa, T Ozawa and K. Higashiyama, Proceedings of the 7th International Symposium on Superconductivity (ISS ‘94), November 8–11, 1994, Kitakyushu.
5. T. J. Doi, T. Yuasa, T. Ozawa and K. Higashiyama, 1995 International Workshop on Superconductivity co-sponsored ISTEC and MRS, June 18–21, 1995, Maui, Hawaii, Extended abstract, pp.221–224.