- CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 711--720. New York, NY, USA, ACM Press, (2006)
- CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 35--44. New York, NY, USA, ACM Press, (2006)
- IEEE Multimedia 12(2):36--44 (2005)
- SI3D '05: Proceedings of the 2005 symposium on Interactive 3D graphics and games, page 65--72. New York, NY, USA, ACM Press, (2005)
- Web Intelligence and Web Agent Systems 4(1):43--59 (2006)
- CHI '03: Proceedings of the SIGCHI conference on Human factors in computing systems, page 337--344. New York, NY, USA, ACM Press, (2003)
- Personal and Ubiquitous Computing 11(2):81--96 (February 2007)
- Computers and Graphics 23(6):893--901 (1999)
- AI Commun. 19(4):369--384 (December 2006)
- IUI '04: Proceedings of the 9th international conference on Intelligent user interface, page 93--100. New York, NY, USA, ACM Press, (2004)
- MobiSys '04: Proceedings of the 2nd international conference on Mobile systems, applications, and services, page 49--58. New York, NY, USA, ACM Press, (2004)
- MobileHCI '06: Proceedings of the 8th conference on Human-computer interaction with mobile devices and services, page 239--246. New York, NY, USA, ACM, (2006)
- Augmenting audio messages with visual directions in mobile guides: an evaluation of three approachesMobileHCI '05: Proceedings of the 7th international conference on Human computer interaction with mobile devices \& services, page 107--114. New York, NY, USA, ACM, (2005)
- MOBIQUITOUS '05: Proceedings of the The Second Annual International Conference on Mobile and Ubiquitous Systems: Networking and Services, page 293--304. Washington, DC, USA, IEEE Computer Society, (2005)
- CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 497--506. New York, NY, USA, ACM, (2008)
- CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 1013--1016. New York, NY, USA, ACM, (2008)
- CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 1247--1256. New York, NY, USA, ACM, (2008)
- IUI '09: Proceedingsc of the 13th international conference on Intelligent user interfaces, page 247--256. New York, NY, USA, ACM, (2008)


user