%0 Journal Article %A N. N. Dedok %T Periodic solutions and the dissipativity of certain systems of differential equations %J Differencialʹnye uravneniâ %D 1974 %P 2071-2072 %V 10 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1974_10_11_a21/ %G ru %F DE_1974_10_11_a21