เฉพาะเล่มที่อ่านบ่อยๆครับ
1.An Introduction to Diophantine Equation by Titu and Dorin
2.Mathematical Olympiad Challenge by Titu
3.A path to combinatorics for Undergraduates by Titu and Zuming
4.Old and new Inequalities by Vasile
5.Pell equation by Barbeau
6.Mathematical Olympiad Treasure by Titu
7.Imo compendium
8.Problem solving Strategies
9.10X problem by Titu
10.mathematic problem around the world by Titu
11.Algebraic Inequality by Vasile
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