%0 Journal Article %A Yu. A. Vorohobko %A A. L. Lebedev %T Duality in filtration problems and optimal control in case of incomplete information on the entry for systems with delay %J Differencialʹnye uravneniâ %D 1990 %P 2002-2004 %V 26 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1990_26_11_a23/ %G ru %F DE_1990_26_11_a23