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@article{DAN_1979_245_2_a1, author = {G. A. Gal'perin}, title = {On systems of perfectly elastic balls moving in space or in a box}, journal = {Doklady Akademii Nauk}, pages = {285--288}, publisher = {mathdoc}, volume = {245}, number = {2}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_245_2_a1/} }
G. A. Gal'perin. On systems of perfectly elastic balls moving in space or in a box. Doklady Akademii Nauk, Tome 245 (1979) no. 2, pp. 285-288. http://geodesic.mathdoc.fr/item/DAN_1979_245_2_a1/