1. F.J. Culetto, F. Pobell: Phys. Rev. Lett. 40, 1104 (1978)
2. F.J. Culetto: Ph. D. Thesis, JOL-Report 1587, Kernforschungsanlage Jülich, West Germany (1979)
3. F. Pobell: In Proc. Int. Conf. on Ternary Superconductors, Lake Geneva, Wisconsin (1980), ed. by G.K. Shenoy, B.D. Dunlap, F.Y. Fradin ( North Holland, New York 1981 ) p. 35
4. N.E. Alekseevskii, V.I. Nizhankovskii: JETP Lett. 31, 58 (1980)
5. U. Poppe, H. Wühl: J. Phys. (Paris) 39, C6–361 (1978);