@article{DAN_1977_233_3_a12,
     author = {A. G. Butkovskiy and L. M. Pustyl'nikov},
     title = {Dynamic optimum control},
     journal = {Doklady Akademii Nauk},
     pages = {311--313},
     publisher = {mathdoc},
     volume = {233},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_3_a12/}
}