webpage http://www.scopus.com/inward/record.url?eid=2-s2.0-84869108654&partnerID=MN8TOARS http://dx.doi.org/10.1145/1125451.1125583
published in CHI '06 Extended Abstracts on Human Factors in Computing Systems Journal CHI'06 extended abstracts on Human factors in computing systems Proceedings Conference on Human Factors in Computing Systems - Proceedings Proceedings