%0 Journal Article
%A V. S. Ryaben'kii
%T A boundary projection operator
%J Doklady Akademii Nauk
%D 1969
%P 521-523
%V 185
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a7/
%G ru
%F DAN_1969_185_3_a7