%0 Journal Article
%A A. M. Il'in
%T A~boundary value problem for the elliptic equation of second order in a~domain with a~narrow slit. 1.~The two-dimensional case
%J Sbornik. Mathematics
%D 1976
%P 459-480
%V 28
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1976_28_4_a1/
%G en
%F SM_1976_28_4_a1