Kurt Bauknecht Birgit Pröll Hannes Werthner E-Commerce and Web Technologies: 6th International Conference, EC-Web 2005, Copenhagen, Denmark, August 23-26, 2005, Proceedings 3590 3-540-28467-2 EC-Web Lecture Notes in Computer Science Springer 2005 db/conf/ecweb/ecweb2005.html