%0 Journal Article
%A Ryszard Grząślewicz
%T Extreme symmetric norms on $R^2$
%J Colloquium Mathematicum
%D 1988
%P 147-151
%V 56
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-56-1-147-151/
%R 10.4064/cm-56-1-147-151
%G en
%F 10_4064_cm_56_1_147_151