TY  - JOUR
AU  - H. Katsuura 
TI  - Three-Dimensional Viviani Theorem on a Tetrahedron
JO  - Journal for geometry and graphics
PY  - 2019
SP  - 179
EP  - 182
VL  - 23
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2019_23_2_JGG_2019_23_2_a3/
ID  - JGG_2019_23_2_JGG_2019_23_2_a3
ER  -