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@article{DE_1984_20_11_a15, author = {V. M. Filippov}, title = {A variational method for solving boundary value problems for the wave equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1961--1968}, publisher = {mathdoc}, volume = {20}, number = {11}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1984_20_11_a15/} }
V. M. Filippov. A variational method for solving boundary value problems for the wave equation. Differencialʹnye uravneniâ, Tome 20 (1984) no. 11, pp. 1961-1968. http://geodesic.mathdoc.fr/item/DE_1984_20_11_a15/