%0 Journal Article %A Yu. V. Churin %T The vanishing of the periodic solutions of quasihomogeneous systems that have only simple exceptional sets %J Differencialʹnye uravneniâ %D 1975 %P 678-686 %V 11 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_4_a9/ %G ru %F DE_1975_11_4_a9