- Author: Wolfram Siemann, Daniel Steuer
- Language: English
- Year: 2019
- Author: Wolfram Siemann
- Language: German
- Year: 1985
- Author: Wolfram Siemann
- Language: English
- Year: 2019
- Author: Wolfram Siemann
- Language: English
- Year: 2019
- Author: Wolfram Siemann (auth.)
- Language: English
- Year: 1985