1. Minkowski addition and mixed volumes;Groemer;Geom. Dedicata,1977
2. Convex Polytopes;Grünbaum,1967
3. Vorlesungen über Inhalt, Oberfläche und Isoperimetrie;Hadwiger,1957
4. The algebra of polytopes in affine spaces;Jessen;Math. Scand.,1978
5. Non-linear angle-sum relations for polyhedral cones and polytopes;McMullen,1975