- Author: Jochen Schröder
- Language: German
- Year: 1990
- Author: Gerhard Helbig
- Language: German
- Year: 1990
- Author: Joachim Buscha
- Language: German
- Year: 1989
- Author: О. Д. Липшиц
- Language: German, Русский
- Year: 1988
- Author: Wolfgang Morgenroth
- Language: German
- Year: 1979
- Author: Theodor Berberoff Peter Rankoff
- Language: German, Bulgarian
- Year: 1971
- Author: K. A. Paffen
- Language: German
- Year: 1970
- Author: Hans-Jürgen Grimm
- Language: German
- Year: 1987
- Author: Theodor Berberoff Dr. Peter Rankoff
- Language: German, Bulgarian
- Year: 1971
- Author: Renate Richter
- Language: German
- Year: 1994