user- The size of the World Wide Web
- Proceedings of the 19th International World Wide Web Conference WWW 2010, Raleigh, NC, USA, ACM, (April 2010)
- Proceedings of the SIGCHI conference on Human factors in computing systems, page 41-48. New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., (1998)
- Proceedings of the CHI97: Conference on Human Factors in Computing Systems, Atlanta, GA, USA, (March 1997)
- International Journal of Human-Computer Studies (2002)
- CHI '01: CHI '01 extended abstracts on Human factors in computing systems, page 379--380. New York, NY, USA, ACM Press, (2001)
- Intelligent Agents: Specification, Modeling, and Applications. 4th Pacific Rim International Workshop on Multi-Agents, PRIMA 2001. Proceedings Lecture Notes in Artificial Intelligence Vol.2132, page 210--21. Dept. of Comput. Sci., Kyonggi Univ., Suwon, South Korea, Springer-Verlag, (2001)
- Proceedings of the Eighth International World-Wide Web Conference, (May 1999)
- HYPERTEXT '98: Proceedings of the ninth ACM conference on Hypertext and hypermedia : links, objects, time and space---structure in hypermedia systems, page 297--298. New York, NY, USA, ACM Press, (1998)
