https://elibrary.klett-cotta.de/article/10.21706/ps-78-6-473
https://elibrary.klett-cotta.de/article/10.21706/ps-78-6-508
https://elibrary.klett-cotta.de/article/10.21706/ps-78-6-536
https://elibrary.klett-cotta.de/article/10.21706/ps-78-6-561
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