Discrete Geometry, Combinatorics and Graph Theory : 7th China-Japan Conference, CJCDGCGT 2005, Tianjin, China, November 18-20, 2005, and Xi'an, China, November 22-24, 2005, Revised Selected Papers - Jin Akiyama, William Y. C. Chen, Mikio Kano, Xueliang Li, Qinglin Yu ((Lecture Notes in Computer Science))