https://elibrary.klett-cotta.de/article/10.21706/ps-80-2-124
https://elibrary.klett-cotta.de/article/10.21706/ps-80-2-152
https://elibrary.klett-cotta.de/article/10.21706/ps-80-2-165
https://elibrary.klett-cotta.de/article/10.21706/ps-80-2-93