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@article{DE_1975_11_2_a21, author = {A. A. Levakov}, title = {On sufficient optimality conditions}, journal = {Differencialʹnye uravneni\^a}, pages = {385--387}, publisher = {mathdoc}, volume = {11}, number = {2}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_2_a21/} }
A. A. Levakov. On sufficient optimality conditions. Differencialʹnye uravneniâ, Tome 11 (1975) no. 2, pp. 385-387. http://geodesic.mathdoc.fr/item/DE_1975_11_2_a21/