Henrique O'Neill Manuela Aparicio Carlos J. Costa Aristidis Protopsaltis Proceedings of the 26th Annual International Conference on Design of Communication, SIGDOC 2008, Lisbon, Portugal, September 22-24, 2008 SIGDOC ACM 2008 978-1-60558-083-8 db/conf/sigdoc/sigdoc2008.html