- Author: Gerhard Raab, Alexander Unger, Fritz Unger
- Language: German
- Year: 2022
- Author: Prof. Dr. Gerhard Raab Dr. Alexander Unger Prof. Dr. Fritz Unger (auth.)
- Language: German
- Year: 2010
- Author: Gerhard Raab Alexander Unger Fritz Unger
- Language: German
- Year: 2018
- Author: Gerhard Raab Alexander Unger Fritz Unger (auth.)
- Language: German
- Year: 2016
- Author: Wolfgang Fuchs Fritz Unger (auth.)
- Language: German
- Year: 2014
- Author: Hugo E. Wessbecher Prof. Dr. Fritz Unger (auth.)
- Language: German
- Year: 1991
- Author: Prof. Dr. Rainer Busch Prof. Dr. Rudolf Dögl Prof. Dr. Fritz Unger (auth.)
- Language: German
- Year: 1995
- Author: Professor Dr. Fritz Unger Professor Dr. Wolfgang Fuchs (auth.)
- Language: German
- Year: 2005
- Author: Gerhard Raab Alexander Unger Fritz Unger (auth.)
- Language: German
- Year: 2009