- Author: K.H.J Buschow F.R. de Boer
- Language: English
- Year: 2003
- Author: Reint de Boer
- Language: English
- Year: 2005
- Author: Richard Leggett Weyert de Boer Scott Janousek
- Language: English
- Year: 2006
- Author: K.H.J Buschow F.R. de Boer
- Language: English
- Year: 2003