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@article{DAN_1974_215_6_a12, author = {V. L. Berdichevsky}, title = {A variational principle}, journal = {Doklady Akademii Nauk}, pages = {1329--1332}, publisher = {mathdoc}, volume = {215}, number = {6}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_215_6_a12/} }
V. L. Berdichevsky. A variational principle. Doklady Akademii Nauk, Tome 215 (1974) no. 6, pp. 1329-1332. http://geodesic.mathdoc.fr/item/DAN_1974_215_6_a12/