@article{DAN_1989_306_6_a3,
     author = {E. N. Orel},
     title = {A method for solving optimal control problems},
     journal = {Doklady Akademii Nauk},
     pages = {1301--1304},
     publisher = {mathdoc},
     volume = {306},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_6_a3/}
}