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@article{DAN_1991_319_2_a7, author = {M. A. Sychev}, title = {A classical problem of the calculus of variations}, journal = {Doklady Akademii Nauk}, pages = {292--295}, publisher = {mathdoc}, volume = {319}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_2_a7/} }
M. A. Sychev. A classical problem of the calculus of variations. Doklady Akademii Nauk, Tome 319 (1991) no. 2, pp. 292-295. http://geodesic.mathdoc.fr/item/DAN_1991_319_2_a7/