%0 Journal Article %A A. N. Yarkin %T Occurrence of an internal boundary layer in singularly perturbed systems of conditionally stable type %J Differencialʹnye uravneniâ %D 1976 %P 2285-2286 %V 12 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1976_12_12_a24/ %G ru %F DE_1976_12_12_a24