%0 Journal Article
%A Jan Boman
%T The sum of two plane convex C... sets is not always C...
%J Mathematica Scandinavica
%D 1990
%P 216-224
%V 66
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167106/
%F MS2_1990__66_1_167106