1. Mathematische Probleme;Hilbert;Nachr. Gesellschaft Wiss. Göttingen Math.Phys. Kl.,1900
2. Space-filling tetrahedra in Euclidean space;Sommerville,1923
3. Division of space by congruent triangles and tetrahedra;Somerville,1923
4. Packings of spherical triangles and tetrahedra;Davies,1965