%0 Journal Article
%A V. R. Portnov
%T A certain projection operator of S.\,L.~Sobolev type
%J Doklady Akademii Nauk
%D 1969
%P 258-260
%V 189
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_189_2_a8/
%G ru
%F DAN_1969_189_2_a8