%0 Journal Article
%A V. I. Gorbachuk
%A M. L. Gorbachuk
%T Expansion in the eigenfunctions of second order differential equation with operator coefficients
%J Doklady Akademii Nauk
%D 1969
%P 774-777
%V 184
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_184_4_a2/
%G ru
%F DAN_1969_184_4_a2