%0 Journal Article
%A V. A. Kondrat'ev
%A S. D. Èidel'man
%T On the summability of positive solutions of partial differential equations of arbitrary order in a~neighborhood of a~characteristic manifold
%J Sbornik. Mathematics
%D 1976
%P 521-531
%V 28
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1976_28_4_a5/
%G en
%F SM_1976_28_4_a5