@article{TM_2011_273_a8,
     author = {V. V. Kozlov},
     title = {Problem of stability of two-link trajectories in a~multidimensional {Birkhoff} billiard},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {212--230},
     year = {2011},
     volume = {273},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_273_a8/}
}