@article{DE_1977_13_12_a6,
     author = {A. S. Koshcheev},
     title = {Estimation of the states of controllable systems under conditions of indeterminacy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2168--2179},
     publisher = {mathdoc},
     volume = {13},
     number = {12},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_12_a6/}
}