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I. DELGADILLO-HOLTFORT
Exp.-Phys. III, Solid State Spectroscopy, Ruhr-Universität on leave from CINVESTAV-IPN, Depto. Física, 07000 MEXICO D.F.
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B. K. BEIN
Exp.-Phys. III, Solid State Spectroscopy, Ruhr-Universität
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J. PELZL
Exp.-Phys. III, Solid State Spectroscopy, Ruhr-Universität