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@article{DAN_1984_275_1_a2, author = {G. A. Gal'perin}, title = {The existence of nonperiodic and not everywhere dense billiard}, journal = {Doklady Akademii Nauk}, pages = {18--22}, publisher = {mathdoc}, volume = {275}, number = {1}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_1_a2/} }
G. A. Gal'perin. The existence of nonperiodic and not everywhere dense billiard. Doklady Akademii Nauk, Tome 275 (1984) no. 1, pp. 18-22. http://geodesic.mathdoc.fr/item/DAN_1984_275_1_a2/