@article{DAN_1983_272_2_a6,
     author = {A. V. Dmitruk},
     title = {Quadratic conditions for the {Pontryagin} minimum in an optimal},
     journal = {Doklady Akademii Nauk},
     pages = {285--289},
     publisher = {mathdoc},
     volume = {272},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_2_a6/}
}