%0 Journal Article %A M. V. Alexeevsky %T Difference schemes of a high order of accuracy for a singularly perturbed boundary value problem %J Differencialʹnye uravneniâ %D 1981 %P 1171-1183 %V 17 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1981_17_7_a1/ %G ru %F DE_1981_17_7_a1