@article{TMF_2001_129_1_a10,
     author = {S. V. Naydenov and V. V. Yanovskii},
     title = {Geometric-Dynamic {Approach} to {Billiard} {Systems:} {II.~Geometric} {Features} of {Involutions}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {116--130},
     publisher = {mathdoc},
     volume = {129},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_1_a10/}
}