@article{DAN_1988_303_2_a7,
     author = {L. A. Muravei},
     title = {The wave equation in an unbounded domain with a star-shaped},
     journal = {Doklady Akademii Nauk},
     pages = {293--297},
     publisher = {mathdoc},
     volume = {303},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_303_2_a7/}
}