Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1972_8_2_a0, author = {E. E. Barbashina}, title = {On the theory of necessary second order optimality {conditions.~I}}, journal = {Differencialʹnye uravneni\^a}, pages = {199--213}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_2_a0/} }
E. E. Barbashina. On the theory of necessary second order optimality conditions.~I. Differencialʹnye uravneniâ, Tome 8 (1972) no. 2, pp. 199-213. http://geodesic.mathdoc.fr/item/DE_1972_8_2_a0/