%0 Journal Article %A Yu. A. Konyaev %T A new approach to the investigation of linear singularly perturbed problems in the presence of identically multiple and imaginary points of the spectrum %J Differencialʹnye uravneniâ %D 1985 %P 1811-1814 %V 21 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1985_21_10_a27/ %G ru %F DE_1985_21_10_a27