@article{VMUMM_2024_3_a2,
     author = {K. E. Turina},
     title = {Topological invariants of some ordered billiard games},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {19--25},
     year = {2024},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2024_3_a2/}
}