1. Farewell to the Reader;The Colorado Mathematical Olympiad: The Third Decade and Further Explorations;2017
2. E21. Cover-Up with John Conway, Mitya Karabash, and Ron Graham;The Colorado Mathematical Olympiad: The Third Decade and Further Explorations;2017
3. Twenty-First Colorado Mathematical Olympiad;The Colorado Mathematical Olympiad: The Third Decade and Further Explorations;2017
4. An upper bound of Heilbronn number for eight points in triangles;Journal of Combinatorial Optimization;2013-01-08