Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1965_1_10_a5, author = {V. M. \v{S}alov}, title = {Minimum principle of a quadratic functional for a hyperbolic equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1338--1365}, publisher = {mathdoc}, volume = {1}, number = {10}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1965_1_10_a5/} }
V. M. Šalov. Minimum principle of a quadratic functional for a hyperbolic equation. Differencialʹnye uravneniâ, Tome 1 (1965) no. 10, pp. 1338-1365. http://geodesic.mathdoc.fr/item/DE_1965_1_10_a5/