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@article{DAN_1962_145_3_a12, author = {An. M. Leontovich}, title = {The existence of unbounded oscillating trajectories in a problem of billiards}, journal = {Doklady Akademii Nauk}, pages = {523--526}, publisher = {mathdoc}, volume = {145}, number = {3}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_3_a12/} }
An. M. Leontovich. The existence of unbounded oscillating trajectories in a problem of billiards. Doklady Akademii Nauk, Tome 145 (1962) no. 3, pp. 523-526. http://geodesic.mathdoc.fr/item/DAN_1962_145_3_a12/