%0 Journal Article %A S. G. Kondratenya %T The behavior of the solution of systems of two differential equations in the neighborhood of an essential singularity %J Differencialʹnye uravneniâ %D 1971 %P 747-749 %V 7 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_4_a14/ %G ru %F DE_1971_7_4_a14