%0 Journal Article %A G. Ya. Shafranov %T Generation of periodic motions from an equilibrium state with purely imaginary roots %J Differencialʹnye uravneniâ %D 1974 %P 860-872 %V 10 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1974_10_5_a11/ %G ru %F DE_1974_10_5_a11