%0 Journal Article
%A V. A. Il'in
%A I. A. Shishmarev
%T Fourier series in fundamental systems of functions of the polyharmonic operator
%J Doklady Akademii Nauk
%D 1969
%P 707-709
%V 189
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_189_4_a3/
%G ru
%F DAN_1969_189_4_a3