@article{DE_2000_36_11_a13,
     author = {I. V. Gaishun},
     title = {Linear systems of variable structure. {Controllability} and observability},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1544--1549},
     publisher = {mathdoc},
     volume = {36},
     number = {11},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_11_a13/}
}