%0 Journal Article %A V. S. Rykhlov %A O. V. Parfilova %T On multiple completeness of the root functions of the pencils of differential operators with constant coefficients %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2011 %P 45-58 %V 11 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2011_11_4_a6/ %G ru %F ISU_2011_11_4_a6