S. Mcnee, N. Kapoor, and J. Konstan. CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, page 171--180. New York, NY, USA, ACM, (2006)
T. Ishikawa, P. Klaisubun, M. Honma, and Z. Qian. WI-IATW '06: Proceedings of the 2006 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology (WI-IAT 2006 Workshops)(WI-IATW'06), page 192--195. Washington, DC, USA, IEEE Computer Society, (2006)
Y. Hijikata, K. Iwahama, and S. Nishida. SAC '06: Proceedings of the 2006 ACM symposium on Applied computing, page 1050--1057. New York, NY, USA, ACM, (2006)
G. Groh, and C. Ehmig. GROUP '07: Proceedings of the 2007 international ACM conference on Supporting group work, page 127--136. New York, NY, USA, ACM, (2007)
Y. Song, Z. Zhuang, H. Li, Q. Zhao, J. Li, W. Lee, and C. Giles. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 515--522. New York, NY, USA, ACM, (2008)