
- Author: Helmut Dahncke
- Language: German
- Year: 1974

- Author: Dr. Gabler Wiesbaden
- Language: German
- Year: 1973

- Author: Erik Liebreich-Landolt
- Language: German
- Year: 1914

- Author: Wolfgang Paul
- Language: German
- Year: 1958

- Author: William Bateman Hall
- Language: German
- Year: 1958

- Author: Philipp Kruel
- Language: German
- Year: 1935

- Author: H.G. Hoserer
- Language: German
- Year: 1936

- Author: Ernst A. Heinz
- Language: German
- Year: 1990