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@article{DAN_1993_333_3_a0, author = {A. V. Arutyunov}, title = {Degenerate quadratic forms of the calculus of variations}, journal = {Doklady Akademii Nauk}, pages = {277--281}, publisher = {mathdoc}, volume = {333}, number = {3}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_3_a0/} }
A. V. Arutyunov. Degenerate quadratic forms of the calculus of variations. Doklady Akademii Nauk, Tome 333 (1993) no. 3, pp. 277-281. http://geodesic.mathdoc.fr/item/DAN_1993_333_3_a0/