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@article{DAN_1987_292_3_a0, author = {N. A. Bobylev}, title = {A characteristic of extremals of variational problems}, journal = {Doklady Akademii Nauk}, pages = {521--524}, publisher = {mathdoc}, volume = {292}, number = {3}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_292_3_a0/} }
N. A. Bobylev. A characteristic of extremals of variational problems. Doklady Akademii Nauk, Tome 292 (1987) no. 3, pp. 521-524. http://geodesic.mathdoc.fr/item/DAN_1987_292_3_a0/