https://elibrary.klett-cotta.de/article/10.21706/ps-79-5-347
https://elibrary.klett-cotta.de/article/10.21706/ps-79-5-374
https://elibrary.klett-cotta.de/article/10.21706/ps-79-5-402
https://elibrary.klett-cotta.de/article/10.21706/ps-79-5-422