Guoping Qiu Clement Leung Xiangyang Xue Robert Laurini Advances in Visual Information Systems, 9th International Conference, VISUAL 2007, Shanghai, China, June 28-29, 2007 Revised Selected Papers VISUAL Lecture Notes in Computer Science 4781 Springer 2007 978-3-540-76413-7 db/conf/visual/visual2007.html