B. Kim, Q. Li, и A. Howe. WWW '06: Proceedings of the 15th international conference on World Wide Web, стр. 973--974. New York, NY, USA, ACM Press, (2006)
Z. Huang, X. Li, и H. Chen. JCDL '05: Proceedings of the 5th ACM/IEEE-CS joint conference on Digital libraries, стр. 141--142. New York, NY, USA, ACM Press, (2005)
Y. Ding, X. Li, и M. Orlowska. ADC '06: Proceedings of the 17th Australasian Database Conference, стр. 99--107. Darlinghurst, Australia, Australia, Australian Computer Society, Inc., (2006)