@article{DAN_1976_227_3_a19,
     author = {B. A. Ryabov and G. P. Sachkov},
     title = {The requirements for correctness in invariant control systems},
     journal = {Doklady Akademii Nauk},
     pages = {588--591},
     publisher = {mathdoc},
     volume = {227},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_3_a19/}
}