%0 Journal Article %A S. A. Nazarov %T Estimates for the accuracy of modelling boundary-value problems at the %J Izvestiya. Mathematics %D 2004 %P 1179-1215 %V 68 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2004_68_6_a6/ %G en %F IM2_2004_68_6_a6