%0 Journal Article %A S. G. Kondratenya %A A. I. Yablonskii %T The singular points of the solution of systems of second order differential equations %J Differencialʹnye uravneniâ %D 1970 %P 1970-1975 %V 6 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1970_6_11_a4/ %G ru %F DE_1970_6_11_a4