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"On Periodic Billiard Trajectories in Obtuse Triangles."
Lorenz Halbeisen, Norbert Hungerbühler (2000)
- Lorenz Halbeisen, Norbert Hungerbühler:
On Periodic Billiard Trajectories in Obtuse Triangles. SIAM Rev. 42(4): 657-670 (2000)
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