%0 Journal Article
%A A. V. Guminskaya
%T Index of zero and index at infinity for vector fields with nonnegative operators
%J Trudy Instituta matematiki
%D 2006
%P 44-50
%V 14
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TIMB_2006_14_1_a5/
%G ru
%F TIMB_2006_14_1_a5