Discrete and Computational Geometry Japanese Conference, JCDCG 2000, Tokyo, Japan, November, 22-25, 2000. Revised Papers - Akiyama, Jin; Akiyama, Jin; Kano, Mikio; Kano, Mikio; Urabe, Masatsugu; Urabe, Masatsugu (Springer Berlin Heidelberg : Imprint: Springer, 2001)