%0 Journal Article %A L. A. Muravei %T The wave equation and the Helmholtz equation in an unbounded domain with a star-shaped boundary %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1988 %P 171-180 %V 185 %U http://geodesic.mathdoc.fr/item/TM_1988_185_a12/ %G ru %F TM_1988_185_a12