@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/}
}