%0 Journal Article %A A. G. Cheremensky %T Observability and stability with respect to some variables %J Differencialʹnye uravneniâ %D 1987 %P 680-685 %V 23 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_4_a13/ %G ru %F DE_1987_23_4_a13