%0 Journal Article
%A A. A. Abramov
%A V. I. Ul'yanova
%A L. F. Yukhno
%T The argument principle in a spectral problem for systems of ordinary differential equations with singularities
%J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki
%D 1998
%P 61-67
%V 38
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZVMMF_1998_38_1_a7/
%G ru
%F ZVMMF_1998_38_1_a7