- Author: Hawkins David R.
- Language: English
- Year: 2013
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- Author: Spandorfer John
- Language: English
- Year: 2010
- Author: Simona De Francisci
- Language: Italian
- Year: 1992
- Author: Gianfranco Contu
- Language: Italian
- Year: 1994
- Author: Rosslenbroich Bernd
- Language: English
- Year: 2014
- Author: Peer Basharat
- Language: English
- Year: 2010