Geodesic
Branching billiards
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1991), pp. 68-72 
I. I. Chigur. Branching billiards. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1991), pp. 68-72. http://geodesic.mathdoc.fr/item/VMUMM_1991_1_a13/
@article{VMUMM_1991_1_a13,
     author = {I. I. Chigur},
     title = {Branching billiards},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {68--72},
     year = {1991},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_1_a13/}
}
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