%0 Journal Article %A Yu. V. Malyshev %T ${\rm C}-{\rm N}$ investigation of systems close to homogeneous ones %J Differencialʹnye uravneniâ %D 1968 %P 233-237 %V 4 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1968_4_2_a3/ %G ru %F DE_1968_4_2_a3