- Author: D.P. Parent
- Language: English
- Year: 1984
- Author: Richard K. Guy
- Language: English
- Year: 1994
- Author: P. Erdos M. B. Nathanson X. Jia
- Language: English
- Year: 2002
Pell's Equation
pdf
- Author: Edward J. Barbeau
- Language: English
- Year: 2003
- Author: Loren C. Larson
- Language: English
- Year: 1983
Winning solutions
djvu
- Author: Edward Lozansky Cecil Rousseau
- Language: English
- Year: 1996
- Author: Arthur Engel
- Language: English
- Year: 1998
- Author: Arthur Engel
- Language: English
- Year: 1998
- Author: Duan Djuki Vladimir Jankovi Ivan Mati Nikola Petrovi
- Language: English
- Year: 2006
Problems in geometry
djvu
- Author: Marcel Berger P. Pansu J.-P. Berry X. Saint-Raymond Silvio Levy
- Language: English
- Year: 1984