Discrete and Computational Geometry Japanese Conference, JCDCG'98 Tokyo, Japan, December 9-12, 1998 Revised Papers - Akiyama, Jin; Akiyama, Jin; Kano, Mikio; Kano, Mikio; Urabe, Masatsugu; Urabe, Masatsugu (Springer Berlin Heidelberg : Imprint: Springer, 2000)