%0 Journal Article %A A. S. Koshcheev %T Estimation of the states of controllable systems under conditions of indeterminacy %J Differencialʹnye uravneniâ %D 1977 %P 2168-2179 %V 13 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_12_a6/ %G ru %F DE_1977_13_12_a6