%0 Journal Article
%A L. I. Kamynin
%T A~theorem on the internal derivative for a~weakly degenerate second-order elliptic equation
%J Sbornik. Mathematics
%D 1986
%P 297-316
%V 54
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1986_54_2_a1/
%G en
%F SM_1986_54_2_a1