@article{DAN_1992_323_4_a6,
     author = {G. Gudvin and Ya. Z. Tsypkin},
     title = {Robust control systems with an internal model},
     journal = {Doklady Akademii Nauk},
     pages = {640--644},
     publisher = {mathdoc},
     volume = {323},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_4_a6/}
}