The average length of a trajectory in a certain billiard in a flat two-torus.
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Boca, F. P., Gologan, R. N., Zaharescu, A. (2003)
The New York Journal of Mathematics [electronic only]
Loskutov, Alexander, Leonel, Edson D. (2009)
Mathematical Problems in Engineering
Howard, J.E. (2009)
Mathematical Problems in Engineering
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