- Author: Janson Alban, Tigges Florian
- Language: English, German
- Year: 2014
- Author: Minke Gernot
- Language: English
- Year: 2013
- Author: Maarten Meijs, Ulrich Knaack
- Language: English
- Year: 2009
- Author: S R Pandi-Perumal, Jaime M Monti
- Language: English
- Year: 2006
- Author: R Daniel Mauldin
- Language: English
- Year: 1981
- Author: Walter Benz
- Language: English
- Year: 2007
- Author: Titu Andreescu, D Andrica, Zuming Feng
- Language: English
- Year: 2007
- Author: Radmila Bulajich Manfrino, José Antonio Gómez Ortega, Rogelio Valdez Delgado
- Language: English
- Year: 2009
- Author: Philip J Davis, Reuben Hersh
- Language: English
- Year: 1981
- Author: Ted Newman, Allen I Janis, John R Porter
- Language: English
- Year: 1992