- Author: Alexander H. Trechsel
- Language: English
- Year: 2007
- Author: Hanspeter Kriesi Alexander H. Trechsel
- Language: English
- Year: 2008
- Author: Fernando Mendez Alexander H. Trechsel
- Language: English
- Year: 2004
- Author: Hanspeter Kriesi Alexander H. Trechsel
- Language: English
- Year: 2008