@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/}
}