@article{TMF_2002_130_2_a6,
     author = {S. V. Naydenov and V. V. Yanovskii},
     title = {Invariant {Distributions} in {Systems} with {Elastic} {Reflections}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {301--319},
     publisher = {mathdoc},
     volume = {130},
     number = {2},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2002_130_2_a6/}
}