References:
- Peter Grabarchuk, Modern Classic Puzzles, Sterling, 2008.
- Nikolai Chernov, Roberto Markarian, Chaotic Billiards, American Mathematical Society, Mathematical Surveys and Monographs Series, 2006.
- PQRST 05 Puzzle Competition, April 2003.
http://www.otuzoyun.com/pqrst/pqrst05.html
- Ivars Peterson, Billiards in the Round, MAA Online, March 3, 1997.
http://www.maa.org/mathland/mathland_3_3.html
- Ivars Peterson (for MatheMUSEments), Tricky Tables , April 3, 2007.
http://musemath.blogspot.com/2007/04/tricky-tables.html
- French World Puzzle Championship (WPC) Qualifying Test, September 3, 2005.
http://math.berkeley.edu/~auroux/frwpc05/2_en3.pdf
- Oliver Knill, Billiards, Math Circle, Northeastern University, 2003.
http://www.math.harvard.edu/~knill/seminars/billiard/billiards.pdf
- The Crazy Billiard Table
http://www.mathhelpforum.com/math-help/geometry/98401-crazy-billiard-table.html
- Ken Duisenberg, The Path of a Billiard Ball
http://ken.duisenberg.com/potw/archive/arch99/991107sol.html
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