%0 Journal Article
%A Hołubowski, Waldemar
%T An inverse matrix of an upper triangular matrix can be lower triangular
%J Discussiones Mathematicae. General Algebra and Applications
%D 2002
%P 161-166
%V 22
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DMGAA_2002_22_2_a5/
%G en
%F DMGAA_2002_22_2_a5