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@article{DAN_1968_180_4_a4, author = {A. D. Ioffe and V. M. Tikhomirov}, title = {Duality in problems of the calculus of variations}, journal = {Doklady Akademii Nauk}, pages = {789--792}, publisher = {mathdoc}, volume = {180}, number = {4}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_4_a4/} }
A. D. Ioffe; V. M. Tikhomirov. Duality in problems of the calculus of variations. Doklady Akademii Nauk, Tome 180 (1968) no. 4, pp. 789-792. http://geodesic.mathdoc.fr/item/DAN_1968_180_4_a4/