@article{DE_1996_32_11_a1,
     author = {A. P. Afanas'ev},
     title = {A second-order local variational problem for linear optimal control problems with mixed constraints},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1452--1456},
     publisher = {mathdoc},
     volume = {32},
     number = {11},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_11_a1/}
}