@article{TRSPY_1988_185_a12,
     author = {L. A. Muravei},
     title = {The wave equation and the {Helmholtz} equation in an unbounded domain with a~star-shaped boundary},
     journal = {Informatics and Automation},
     pages = {171--180},
     publisher = {mathdoc},
     volume = {185},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1988_185_a12/}
}