%0 Journal Article
%A Tůma, Jiří
%T A simple geometric proof of a theorem on $M_n$
%J Commentationes Mathematicae Universitatis Carolinae
%D 1985
%P 233-239
%V 26
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1985__26_2_a2/
%G en
%F CMUC_1985__26_2_a2