%0 Journal Article
%A È. I. Grudo
%T On an analytic theory of systems of linear differential equations with an irregular singular point
%J Differencialʹnye uravneniâ
%D 1965
%P 318-326
%V 1
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1965_1_3_a4/
%G ru
%F DE_1965_1_3_a4