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@article{ELMA_1992__47_3_141533, author = {Norbert Hungerb\"uhler}, title = {Geometrical {Aspects} of the {Circular} {Billiard} {Problem.}}, journal = {Elemente der Mathematik}, pages = {114--117}, publisher = {mathdoc}, volume = {47}, number = {3}, year = {1992}, zbl = {0800.70052}, url = {http://geodesic.mathdoc.fr/item/ELMA_1992__47_3_141533/} }
Norbert Hungerbühler. Geometrical Aspects of the Circular Billiard Problem.. Elemente der Mathematik, Tome 47 (1992) no. 3, pp. 114-117. http://geodesic.mathdoc.fr/item/ELMA_1992__47_3_141533/