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)
Y. Jin, R. Li, Y. Cai, Q. Li, A. Daud, и Y. Li. Proceedings of the 11th international conference on Web-age information management, стр. 139--150. Berlin, Heidelberg, Springer-Verlag, (2010)