%0 Journal Article
%A E. G. Sitnikova
%T A~strong zero theorem for an elliptic equation of high order
%J Sbornik. Mathematics
%D 1970
%P 349-367
%V 10
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1970_10_3_a4/
%G en
%F SM_1970_10_3_a4