1. Ball., K.: An elementary introduction to modern convex geometry. In: Levy, S. (ed.) Flavors of Geometry. Mathematical Sciences Research Institute Publications, vol. 31, pp. 1–58. Cambridge University Press, Cambridge (1997)
2. Berman, A., Neumann, M., Stern, R.J.: Nonnegative Matrices in Dynamic Systems. Wiley, New York (1989)
3. Calafiore, G.C.: Approximation of n-dimensional data using spherical and ellipsoidal primitives. IEEE Trans. Syst. Man Cybern. 32, 269–278 (2002)
4. Correa, R., Seeger, A.: Directional derivative of a minimax function. Nonlinear Anal. 9, 13–22 (1985)
5. Danskin, J.M.: The theory of max–min, with applications. SIAM J. Appl. Math. 14, 641–664 (1966)