%0 Journal Article %A V. A. Pliss %T The structural stability of a sequence of linear systems of second order differential equations with periodic coefficients %J Differencialʹnye uravneniâ %D 1971 %P 261-270 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_2_a7/ %G ru %F DE_1971_7_2_a7