1. F. Burg�zy, H. Jaeger, K. Schulze, P. Lamparter, S. Steeb,Z. Naturforsch. 1989,44A, 180.
2. G. Dr�ger, O. Br�mmer,Phys. Stat. Sol. 1984,B 124, 11.
3. V. Barnole, J.-M. Mariot, C. F. Hague,Phys. Rev. 1990,B 41, 4262.
4. F. Burg�zy, H. Jaeger, C. Politis, P. Lamparter, S. Steeb, in:Electronic Properties of High-T c- Superconductors and Related Compounds (H. Kuzmany, M. Mehring, J. Fink, eds.), Springer, Berlin Heidelberg New York Tokyo, p. 135.
5. J. Redinger, A. J. Freeman, J. Yu, S. Massidda,Phys. Lett. 1987,A 124, 469.