@article{DE_1994_30_6_a1,
     author = {I. V. Gaishun},
     title = {Differential-difference two-parameter control systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {931--938},
     year = {1994},
     volume = {30},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_6_a1/}
}