%0 Journal Article %A I. S. Lomov %T Integral Representations of a Partial Sum of a Biorthogonal Series for Higher-Order Differential Operators %J Differencialʹnye uravneniâ %D 2003 %P 602-611 %V 39 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2003_39_5_a2/ %G ru %F DE_2003_39_5_a2