%0 Journal Article
%A A. N. Erugin
%T Certain analytic singularities in the solution of a differential equation in the case of a focus
%J Differencialʹnye uravneniâ
%D 1968
%P 423-428
%V 4
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1968_4_3_a3/
%G ru
%F DE_1968_4_3_a3