%0 Journal Article %A V. F. Tkachev %T Generalization of a~theorem of H.~Poincar\'e on the non-existence of limit cycles and some other results %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1961 %V 16 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1961_16_5_a14/ %G ru %F RM_1961_16_5_a14