@article{DE_1995_31_11_a14,
     author = {F. P. Vasil'ev},
     title = {On duality in linear problems of control and observation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1893--1900},
     publisher = {mathdoc},
     volume = {31},
     number = {11},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_11_a14/}
}