%0 Journal Article
%A V. A. Il'in
%T Fourier series in fundamental systems of functions of the Beltrami operator
%J Differencialʹnye uravneniâ
%D 1969
%P 1940-1978
%V 5
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_11_a1/
%G ru
%F DE_1969_5_11_a1