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@article{DE_1973_9_3_a1, author = {V. I. Blagodatskikh}, title = {A sufficient optimality condition}, journal = {Differencialʹnye uravneni\^a}, pages = {416--422}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_3_a1/} }
V. I. Blagodatskikh. A sufficient optimality condition. Differencialʹnye uravneniâ, Tome 9 (1973) no. 3, pp. 416-422. http://geodesic.mathdoc.fr/item/DE_1973_9_3_a1/