%0 Journal Article %A V. B. Andreev %T On the accuracy of modified difference and finite-element schemes for a model problem on cracks %J Differencialʹnye uravneniâ %D 1981 %P 1184-1192 %V 17 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1981_17_7_a2/ %G ru %F DE_1981_17_7_a2