수학 문제
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- Petrunin, Anton. “Exercises in Orthodox Geometry.” arXiv:0906.0290 [math], June 1, 2009. http://arxiv.org/abs/0906.0290.
 - Arnol'd, Vladimir I. 1991. A mathematical trivium. Russian Mathematical Surveys 46, no. 1 (2): 271-278. doi:10.1070/RM1991v046n01ABEH002727.
 - Arnol'd, Vladimir I. 1993. A mathematical trivium II. Russian Mathematical Surveys 48, no. 1 (2): 217-232. doi:10.1070/RM1993v048n01ABEH001009.
 - Don Zagier, Problems posed at the St Andrews Colloquium, 1996
 - The IMO Compendium
 - KAIST Math Problem of the Week
 - http://icms.kaist.ac.kr/new_sub05/sub05_02_02.php
 - More than 20,000 mathematics contest problems and solutions