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@article{DAN_1992_326_5_a0, author = {A. V. Arutyunov}, title = {Sign-definiteness of quadratic forms of the calculus of variations}, journal = {Doklady Akademii Nauk}, pages = {759--764}, publisher = {mathdoc}, volume = {326}, number = {5}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_326_5_a0/} }
A. V. Arutyunov. Sign-definiteness of quadratic forms of the calculus of variations. Doklady Akademii Nauk, Tome 326 (1992) no. 5, pp. 759-764. http://geodesic.mathdoc.fr/item/DAN_1992_326_5_a0/