@article{TMF_1994_98_2_a1,
     author = {K. M. Efimov},
     title = {Theorem of {Liv\v{s}ic} type for dispersed billiards},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {184--196},
     publisher = {mathdoc},
     volume = {98},
     number = {2},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1994_98_2_a1/}
}