@article{DAN_1970_193_6_a0,
     author = {A. A. Arsen'ev},
     title = {The behavior of the energy of a solution of the wave equation in an unbounded region, for large values of the time},
     journal = {Doklady Akademii Nauk},
     pages = {1215--1217},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_6_a0/}
}