- Author: Russ Charles V. J
- Language: English
- Year: 2006
- Author: Russ Charles V. J
- Language: English
- Year: 2006
- Author: Anne Pauwels
- Language: English
- Year: 1986
- Author: Müller Gunter
- Language: German
- Year: 1993
- Author: Fedders Wolfgang
- Language: German
- Year: 1993
- Author: Niebaum Hermann
- Language: German
- Year: 1974
- Author: Schleef Wilhelm
- Language: German
- Year: 1967