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@article{DAN_1961_140_1_a9, author = {M. K. Kerimov}, title = {On the theory of the second variation for discontinuous variational problems in space}, journal = {Doklady Akademii Nauk}, pages = {41--44}, publisher = {mathdoc}, volume = {140}, number = {1}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_140_1_a9/} }
M. K. Kerimov. On the theory of the second variation for discontinuous variational problems in space. Doklady Akademii Nauk, Tome 140 (1961) no. 1, pp. 41-44. http://geodesic.mathdoc.fr/item/DAN_1961_140_1_a9/