@article{DAN_1977_233_4_a10,
     author = {Yu. S. Osipov and S. P. Okhezin},
     title = {On the theory of positional control in hyperbolic systems},
     journal = {Doklady Akademii Nauk},
     pages = {551--554},
     publisher = {mathdoc},
     volume = {233},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a10/}
}