%0 Journal Article %A Yu. M. Aponin %T Asymptotic estimate of the error in the calculation of the separatrix of a system of two ordinary differential equations %J Differencialʹnye uravneniâ %D 1980 %P 579-588 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_4_a0/ %G ru %F DE_1980_16_4_a0