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Published in: Springer series in solid-state sciences ; 60

Published in: Berichte aus der Physik

Published in: International series of monographs on physics ; 142

Published in: International School of Physics Enrico Fermi: Proceedings of the International School of Physics Enrico Fermi ; 96

Published in: NATO: NATO ASI series / B ; 88

Published in: Springer series in solid-state sciences ; 12

Published in: Modern problems in condensed matter sciences ; 4

Published in: Modern problems in condensed matter sciences ; 9

Published in: Physikalische Blätter, 34 (1978) 12, Seite 662-671

Published in: Physik in unserer Zeit, 3 (1972) 5, Seite 146-155