%0 Journal Article %A TvrdĂ˝, Milan %T The normal form and the stability of solutions of a system of differential equations in the complex domain %J Czechoslovak Mathematical Journal %D 1970 %P 39-73 %V 20 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100943/ %R 10.21136/CMJ.1970.100943 %G en %F 10_21136_CMJ_1970_100943