@article{VMUMM_1991_4_a24,
     author = {A. M. Abdrahmanov},
     title = {On the stability of two-link periodic trajectories of a billiard on two-dimensional surfaces of constant curvature},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {88--90},
     publisher = {mathdoc},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a24/}
}