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B. Admassu, V. Lind, W. Friedt, F. Ordon
Pág. 362 - 369
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W. Rygulla, R. J. Snowdon, W. Friedt, I. Happstadius, W. Y. Cheung, and D. Chen
Pág. 215 - 221
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W. Rygulla, R. J. Snowdon, C. Eynck, B. Koopmann, A. von Tiedemann, W. Lühs, and W. Friedt
Pág. 1391 - 1396
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S. Rönicke, V. Hahn, A. Vogler, and W. Friedt
Pág. 834 - 839
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