https://elibrary.klett-cotta.de/article/10.21706/ps-78-5-377
https://elibrary.klett-cotta.de/article/10.21706/ps-78-5-399
https://elibrary.klett-cotta.de/article/10.21706/ps-78-5-430
https://elibrary.klett-cotta.de/article/10.21706/ps-78-5-451
https://elibrary.klett-cotta.de/article/10.21706/ps-78-5-459