@article{DAN_1992_327_4_a6,
     author = {Ya. Z. Tsypkin and A. M. Kerbelev},
     title = {Robust nonlinear discrete control systems},
     journal = {Doklady Akademii Nauk},
     pages = {450--454},
     year = {1992},
     volume = {327},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_327_4_a6/}
}