Carey L. Williamson Mary Ellen Zurko Peter F. Patel-Schneider Prashant J. Shenoy Proceedings of the 16th International Conference on World Wide Web, WWW 2007, Banff, Alberta, Canada, May 8-12, 2007 WWW ACM 2007 db/conf/www/www2007.html 978-1-59593-654-7