%0 Journal Article
%A I. N. Sergeev
%T Definition and properties of characteristic frequencies of a linear equation
%J Trudy Seminara im. I.G. Petrovskogo
%D 2006
%P 249-294
%V 25
%N 25
%U http://geodesic.mathdoc.fr/item/TSP_2006_25_25_a10/
%G ru
%F TSP_2006_25_25_a10