1. Agarwal, P.K., Suri, S.: Surface approximation and geometric partitions. SIAM J. Comput. 27, 1016–1035 (1998)
2. Clarke, K.C.: Analytical and Computer Cartography, 2nd edn. Prentice Hall, Englewood Cliffs (1995)
3. de Berg, M., van Kreveld, M., Overmars, M., Schwarzkopf, O.: Computational Geometry: Algorithms and Applications, 2nd edn. Springer, Berlin (2000)
4. Demaine, E.D., Mitchell, J.S.B., O’Rourke, J.: The open problems project. Problem 33,
http://maven.smith.edu/~orourke/TOPP/P33.html
5. Dent, B.: Cartography - thematic map design, 5th edn. McGraw-Hill, New York (1999)