MATHEMATICS OLYMPIADS & PROBLEM SOLVING
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1. Aha! Solutions - Martin Erickson
2. Arnold Vladimir I. Arnold's Problems
3. Barbeau - polynomials (PBM)
4. De_Nederlandse_Wiskunde_Olympiade
5. IMO 1959-2000 - Mircea Becheanu
6. IMO 1959-2000 - Mircea Becheanu
7. Junior Balkan Mathematical Olympiads
8. Polya - How to solve it
9. Polya - Mathematical Discovery
10. Schwarz - (PBM) 40_puzzles