1. Possible highT c superconductivity in the Ba?La?Cu?O system
2. Perovskite-Type Oxides—the New Approach to High—Tc Superconductivity
3. C. Michel, M. Hervieu and B. Raveau, Proc. Intern. Conf. Modern Aspects of Superconductivity, Paris 1989, p. 17, I.I.T.T.-International 1989.
4. J. Geerk, G. Linker and O. Meyer, Report KfK-4601 (1989).
5. P.V. Huong and J.C. Bruyere, Proc. Intern. Modern Aspects of Superconductivity, Paris 1989, p. 149, I.I.T.T.-International 1989.