- Author: Dirk Grathoff (auth.)
- Language: German
- Year: 2000
- Author: Dirk Grathoff (auth.) Dirk Grathoff (eds.)
- Language: German
- Year: 1988
- Author: Dirk Grathoff (auth.)
- Language: German
- Year: 1993
- Author: Dirk Grathoff (auth.)
- Language: German
- Year: 2000