%0 Journal Article
%A V. G. Il'ichev
%A O. A. Il'icheva
%T Sign-invariant structures of matrices, and discrete models
%J Diskretnaya Matematika
%D 1999
%P 89-100
%V 11
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DM_1999_11_4_a7/
%G ru
%F DM_1999_11_4_a7