1. See, as an example,K. A. Müller, M. Takashige andJ. G. Bednorz:Phys. Rev. Lett.,58, 1143 (1987);G. Giovannella, C. Chappert, P. Beauvillain andG. Collin:Int. J. Mod. Phys. B,1, 1011 (1987);C. Giovannella:Phys. Status Solidi,154, 273 (1989);M. Tinkham:Phys. Rev. Lett.,61, 1658 (1988);Y. Yeshurun andA. P. Malozemoff:Phys. Rev. Lett.,60 2202 (1988).
2. R. Kleiner, P. Müller, H. Kohlstedt, N. F. Pedersen andS. Sakai:Phys. Rev. B,50, 3942 (1994);R. Kleiner andP. Müller:Phys. Rev. B,42, 1327 (1994).
3. R. Gross:Proceedings of the VII International Symposium on Weak Superconductivity, edited byŠ. Beňačka, P. Seidel andV. Štrbík (IEESAS, Smolenice, 1994), p. 65.
4. See, for example,C. Camerlingo, H. Huang, B. Ruggiero, M. Russo, E. Sarnelli andG. Testa:Proceedings of the VII International Symposium on Weak Superconductivity, edited byŠ. Beňačka, P. Seidel andV. Štrbík (IEESAS, Smolenice, 1994), p. 324.
5. P. Martinoli: private communication.