@article{DAN_1958_121_3_a9,
     author = {A. S. Kel'zon and O. V. Grigor'eva},
     title = {Proportional navigation as a problem of cybernetics},
     journal = {Doklady Akademii Nauk},
     pages = {432--435},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a9/}
}