1. See, for example, Superconductivity in Magnetic and Exotic Materials, ed. T. Matsubara and A. Kotani, Springer Series in Solid State Science, Berlin, Springer, 1984, vol. 42, p. 1.
2. See, for example, Superconductivity in Ternary Compounds, ed. M. B. Maple and Ø. Fisher, Topics in Current Physics, Berlin, Springer1983, vol. 34;
3. Superconductivity above 90 K in the square-planar compound systemABa2Cu3O6+xwithA=Y, La, Nd, Sm, Eu, Gd, Ho, Er and Lu
4. P. Day in Encyclopoedia of Advanced Materials, ed. D. Bloor, R. J. Brook, M. C. Flemmings and S. Mahajan, Pergamon, Oxford, 1994, p. 419.
5. T. Ishiguro and K.Yamaji, Organic Superconductors, Springer, Berlin, 1990;