@article{DE_2004_40_11_a10,
     author = {I. V. Gaishun},
     title = {Observability conditions for general linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1532--1539},
     publisher = {mathdoc},
     volume = {40},
     number = {11},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_11_a10/}
}