Gunilla Borgefors Ingela Nyström Gabriella Sanniti di Baja Discrete Geometry for Computer Imagery, 9th International Conference, DGCI 2000, Uppsala, Sweden, December 13-15, 2000, Proceedings DGCI Lecture Notes in Computer Science 1953 Springer 2000 3-540-41396-0 db/conf/dgci/dgci2000.html