@article{DAN_1989_304_1_a0,
     author = {A. V. Arutyunov},
     title = {On the theory of the maximum principle in optimal control problems},
     journal = {Doklady Akademii Nauk},
     pages = {11--14},
     publisher = {mathdoc},
     volume = {304},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_1_a0/}
}