%0 Journal Article %A A. P. Krishchenko %A S. B. Tkachev %T Duality of nonlinear dynamical systems, and the synthesis of observers %J Differencialʹnye uravneniâ %D 1999 %P 649-663 %V 35 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1999_35_5_a9/ %G ru %F DE_1999_35_5_a9