1. Bednorz, J.G., Müller, K.A.: Z. Phys. B-Condensed Matter64, 189 (1986)
2. Wu, M.K., Ashburn, J.R., Torng, C.J., Hor, P.H., Meng, R.L., Gao, L., Huang, Z.J., Wang, Y.O., Chu, C.W.: Phys. Rev. Lett.58, 908 (1987)
3. see, e.g.: Proceedings of the 18th International Conference of Low Temperature Physics, Kyoto (1987), published in: Jpn. J. Appl. Phys.26, [Suppl.] 26?3 (1987);
4. Proceedings of Yamada '87, Conference of Superconductivity in Highly Correlated Fermion Systems, Sendai (1987). Amsterdam: North-Holland 1987
5. see, e.g., Proceedings of the International Symposium of Novel Mechanisms of Superconductivity. Wolf, S.A., Kresin, V.Z. (eds.). New York: Plenum Press 1987