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@article{DE_1970_6_11_a23, author = {A. G. Ramm}, title = {Exponential decay of the solution of a hyperbolic equation}, journal = {Differencialʹnye uravneni\^a}, pages = {2099--2100}, publisher = {mathdoc}, volume = {6}, number = {11}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1970_6_11_a23/} }
A. G. Ramm. Exponential decay of the solution of a hyperbolic equation. Differencialʹnye uravneniâ, Tome 6 (1970) no. 11, pp. 2099-2100. http://geodesic.mathdoc.fr/item/DE_1970_6_11_a23/