@article{VMUMM_1988_6_a10,
     author = {S. V. Bolotin},
     title = {First integrals of systems with elastic reflections},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {42--45},
     publisher = {mathdoc},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_6_a10/}
}