P. Chirita, W. Nejdl, R. Paiu, and C. Kohlsch&\#252;tter. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 178--185. New York, NY, USA, ACM Press, (2005)
G. Xue, H. Zeng, Z. Chen, W. Ma, H. Zhang, and C. Lu. SIGIR '03: Proceedings of the 26th annual international ACM SIGIR conference on Research and development in informaion retrieval, page 56--63. New York, NY, USA, ACM, (2003)
J. Zhou, C. Ding, and D. Androutsos. CASCON '06: Proceedings of the 2006 conference of the Center for Advanced Studies on Collaborative research, New York, NY, USA, ACM, (2006)
M. Hansen, and E. Shriver. CIKM '01: Proceedings of the tenth international conference on Information and knowledge management, page 135--142. New York, NY, USA, ACM, (2001)
E. Agichtein, and Z. Zheng. Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 902--908. New York, NY, USA, ACM, (2006)
D. Morris, M. Morris, and G. Venolia. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 1207--1216. New York, NY, USA, ACM, (2008)