%0 Journal Article
%A N. V. Assonova
%T Hilbert and Bessel Properties of Systems of Root Functions of $2m$th-Order Operators
%J Differencialʹnye uravneniâ
%D 2001
%P 299-309
%V 37
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2001_37_3_a1/
%G ru
%F DE_2001_37_3_a1