%0 Journal Article %A V. F. Butuzov %A A. V. Nesterov %T A singularly perturbed boundary value problem of elliptic type with nonsmooth angular boundary layer functions %J Differencialʹnye uravneniâ %D 1985 %P 1751-1755 %V 21 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1985_21_10_a16/ %G ru %F DE_1985_21_10_a16