%0 Journal Article
%A H. Katsuura 
%T Three-Dimensional Viviani Theorem on a Tetrahedron
%J Journal for geometry and graphics
%D 2019
%P 179-182
%V 23
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JGG_2019_23_2_JGG_2019_23_2_a3/
%F JGG_2019_23_2_JGG_2019_23_2_a3