@article{TMF_2001_127_1_a7,
     author = {S. V. Naydenov and V. V. Yanovskii},
     title = {Geometric-Dynamic {Approach} to {Billiard} {Systems:} {I.~Projective} {Involution} of a {Billiard,} {Direct} and {Inverse} {Problems}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {110--124},
     publisher = {mathdoc},
     volume = {127},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_127_1_a7/}
}