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Reference13 articles.
1. See, for instance, Superconductivity in Magnetic and Exotic Materials, ed. by T. Matsubara and A. Kotani (Springer, Berlin, Heidelberg, New York, 1984).
2. A. Kotani and K. Okada, in Superconductivity in Magnetic and Exotic Materials, ed. by T. Matsubara and A. Kotani (Springer, Berlin, Heidelberg, New York, 1984), p. 64.
3. H. Matsumoto, H. Umezawa, and M. Tachiki, Solid State Commun. 31, 157 (1979); M. Tachiki, A. Kotani, H. Matsumoto, and H. Umezawa, Solid State Commun. 31, 927 (1979).
4. E. I. Blount and C. M. Varma, Phys. Rev. Lett. 42, 1079 (1979).
5. A. Kotani, S. Takahashi, T. Koyama, M. Tachiki, H. Matsumoto, and H. Umezawa, J. Phys. Soc. Jpn. 50, 3254 (1981).