E-commerce and web technologies : 6th international conference, EC-web 2005, Copenhagen, Denmark, August 23-26, 2005 / proceedings ; Kurt Bauknecht, Birgit Pröll, Hannes Werthner (eds.). - Bauknecht, Kurt, 1936-; Pröll, Birgit; Werthner, Hannes, 1954- (Lecture notes in computer science,, 2005)