%0 Journal Article %A Ya. S. Baris %T The reduction principle for a singularly perturbed system %J Differencialʹnye uravneniâ %D 1979 %P 1390-1394 %V 15 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1979_15_8_a2/ %G ru %F DE_1979_15_8_a2