- Author: Helmholz Richard H.
- Language: German
- Year: 1992
- Author: Helmholz Richard, Zimmermann Reinhard
- Language: German
- Year: 1998
- Author: Helmholz Richard H., Sellar W. David H.
- Language: English
- Year: 2009
- Author: Helmholz Richard H., Hill Mark
- Language: English
- Year: 2017