%0 Journal Article
%A N. B. Medvedeva
%T On the Analytic Solvability of the Problem of Distinguishing between Center and Focus
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 2006
%P 11-100
%V 254
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_2006_254_a1/
%G ru
%F TM_2006_254_a1