M. Develin, F. Santos, and B. Sturmfels. In "Discrete and Computational Geometry" (E. Goodman, J. Pach and E. Welzl, eds), MSRI Publications, Cambridge Univ. Press, 2005. ISBN-10: 0521848628, (2003)cite arxiv:math/0312114
Comment: 20 pages, 1 figure.