%0 Journal Article %A V. A. Pliss %T An investigation of a non-linear system of three differential equations %J Doklady Akademii Nauk %D 1957 %P 184-187 %V 117 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_117_2_a5/ %G ru %F DAN_1957_117_2_a5