TY  - JOUR
AU  - H. Katsuura 
TI  - Solid Angle Sum of a Tetrahedron
JO  - Journal for geometry and graphics
PY  - 2020
SP  - 29
EP  - 34
VL  - 24
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JGG_2020_24_1_JGG_2020_24_1_a2/
ID  - JGG_2020_24_1_JGG_2020_24_1_a2
ER  -