BUSEMANN, H. 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://www.mscand.dk/article/view/10922. Acesso em: 8 may. 2024.