@article{DE_1991_27_2_a0,
     author = {I. V. Gaishun and V. Q. Hoang},
     title = {Conditions for complete controllability and observability of discrete two-parameter systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {187--193},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_2_a0/}
}