%0 Journal Article
%A P. V. Nikolenko
%T On the structure of the pre-image of zero of a nonnegative solution of a homogeneous equation with a biharmonic principal part
%J Differencialʹnye uravneniâ
%D 1989
%P 1058-1059
%V 25
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1989_25_6_a25/
%G ru
%F DE_1989_25_6_a25