%0 Journal Article
%A Sokolov, Maksim S.
%T An abstract approach to some spectral problems of direct sum differential operators
%J Electronic Journal of Differential Equations
%D 2003
%V 2003
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a16/
%G en
%F EJDE_2003__2003__a16