%0 Journal Article %A E. A. Nazarov %T Methods for making trajectories tend to a limit cycle in case of a system of three differential equations with non-analytic right-hand sides %J Differencialʹnye uravneniâ %D 1965 %P 313-317 %V 1 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1965_1_3_a3/ %G ru %F DE_1965_1_3_a3