%0 Journal Article
%A Johan Gielis
%A Stefan Haesen
%A Leopold Verstraelen
%T Universal natural shapes
%J Kragujevac Journal of Mathematics
%D 2005
%P 57 - 68
%V 28
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/KJM_2005_28_1_a4/
%F KJM_2005_28_1_a4