- Author: Joachim Kersten
- Language: German
- Year: 1997
- Author: Hans-Joachim Heuer
- Language: German
- Year: 1994
- Author: Winfried Gebhardt (editor), Arnold Zingerle (editor), Michael N. Ebertz (editor)
- Language: German
- Year: 1993
- Author: Thomas Lau
- Language: German
- Year: 1992