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@article{DE_1969_5_7_a15, author = {G. N. Yakovlev}, title = {A certain variational problem}, journal = {Differencialʹnye uravneni\^a}, pages = {1303--1312}, publisher = {mathdoc}, volume = {5}, number = {7}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_7_a15/} }
G. N. Yakovlev. A certain variational problem. Differencialʹnye uravneniâ, Tome 5 (1969) no. 7, pp. 1303-1312. http://geodesic.mathdoc.fr/item/DE_1969_5_7_a15/