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@article{DE_1977_13_11_a14, author = {A. F. Filippov}, title = {A boundary value problem for the wave equation}, journal = {Differencialʹnye uravneni\^a}, pages = {2043--2050}, publisher = {mathdoc}, volume = {13}, number = {11}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a14/} }
A. F. Filippov. A boundary value problem for the wave equation. Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 2043-2050. http://geodesic.mathdoc.fr/item/DE_1977_13_11_a14/