https://elibrary.klett-cotta.de/article/10.21706/ps-79-12-1038
https://elibrary.klett-cotta.de/article/10.21706/ps-79-12-1064
https://elibrary.klett-cotta.de/article/10.21706/ps-79-12-987
https://elibrary.klett-cotta.de/article/10.21706/ps-79-12-1013