- Author: Gerhard Helbig, Wolfgang Schenkel
- Language: German
- Year: 1991
- Author: Gerhard Helbig
- Language: German
- Year: 1986
- Author: Gerhard Helbig
- Language: German
- Year: 1992
- Author: Gerhard Helbig (editor)
- Language: German
- Year: 1971
- Author: Gerhard Helbig
- Language: German
- Year: 1990
- Author: Gerhard Helbig (auth.)
- Language: German
- Year: 1970
- Author: Gerhard Helbig (auth.)
- Language: German
- Year: 1990
- Author: Gerhard Helbig, et al
- Language: German
- Year: 2001
- Author: Gerhard Helbig
- Language: German
- Year: 2001
- Author: Gerhard Helbig Lutz Götze Gert Henrici Hans-Jürgen Krumm
- Language: German
- Year: 2001