@book{12219, author = {Grosse, P.}, title = {Festkorper Probleme XXV: Advances in Solid State Physics. 5th General Conference of the Condensed Matter Division (CMD) of EPS, 18-22 March 1985, Technische Universitat Berlin.}, publisher = {Friedr. Vieweg & Sohn}, year = {1985}, address = {Braunschweig} }