BUSEMANN, Herbert. Convex Bodies and Convexity on Grassmann Cones XI. Sublinear Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 24, p. 93–101, 1969. DOI: 10.7146/math.scand.a-10922. Disponível em: https://tidsskrift.dk/math/article/view/10922. Acesso em: 14 aug. 2026.