S. Bao, G. Xue, X. Wu, Y. Yu, B. Fei, and Z. Su. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 501--510. New York, NY, USA, ACM, (2007)
Y. Yanbe, A. Jatowt, S. Nakamura, and K. Tanaka. JCDL '07: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, page 107--116. New York, NY, USA, ACM, (2007)
L. Nelson, C. Held, P. Pirolli, L. Hong, D. Schiano, and E. Chi. CHI '09: Proceedings of the 27th international conference on Human factors in computing systems, page 1795--1798. New York, NY, USA, ACM, (2009)
M. Carman, M. Baillie, R. Gwadera, and F. Crestani. SIGIR '09: Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval, page 123--130. New York, NY, USA, ACM, (2009)
K. Bischoff, C. Firan, W. Nejdl, and R. Paiu. JCDL '09: Proceedings of the 9th ACM/IEEE-CS joint conference on Digital libraries, page 285--294. New York, NY, USA, ACM, (2009)
P. Chirita, S. Costache, W. Nejdl, and S. Handschuh. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 845--854. New York, NY, USA, ACM, (2007)
B. Krause, A. Hotho, and G. Stumme. 30th European Conference on IR Research, ECIR 2008, volume 4956 of Lecture Notes in Computer Science, page 101-113. Glasgow, UK, Springer, (April 2008)