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Maximum number of collisions among identical hard spheres

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A geometric approach to semi-dispersing billiards

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Unfoldings and global bounds on the number of collisions for generalized semi-dispersing billiards

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Uniform estimates on the number of collisions in semi-dispersing billiards

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A geometric approach to semi-dispersing billiards

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On the sequences of collisions among hard spheres in infinite space

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Collisions in semi-dispersing billiard on Riemannian manifold

D. Burago, S. Ferleger, and A. Kononenko · 2002

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Finite-range repulsive systems of finitely many particles

Xinfu Chen and Reinhard Illner · 2004

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On pinned billiard balls and foldings

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