%0 Journal Article
%A H. Katsuura 
%T In and Ex Spheres of a Tetrahedron
%J Journal for geometry and graphics
%D 2024
%P 19-27
%V 28
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2024_28_1_JGG_2024_28_1_a1/
%F JGG_2024_28_1_JGG_2024_28_1_a1