%0 Journal Article
%A A. V. Marchenko
%T On~the index of boundary value problems for degenerate elliptic operators
%J Sbornik. Mathematics
%D 1972
%P 615-634
%V 16
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1972_16_4_a6/
%G en
%F SM_1972_16_4_a6