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@article{DE_1992_28_6_a13, author = {S. E. Zhelezovsky}, title = {A dual variational principle for the wave equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1033--1039}, publisher = {mathdoc}, volume = {28}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1992_28_6_a13/} }
S. E. Zhelezovsky. A dual variational principle for the wave equation. Differencialʹnye uravneniâ, Tome 28 (1992) no. 6, pp. 1033-1039. http://geodesic.mathdoc.fr/item/DE_1992_28_6_a13/