J. Lu, und J. Callan. SIGIR '06: Proceedings of the 29th annual international ACM SIGIR conference on Research and development in information retrieval, Seite 332--339. New York, NY, USA, ACM, (2006)
N. Kawamae, und K. Takahashi. KDD '05: Proceeding of the eleventh ACM SIGKDD international conference on Knowledge discovery in data mining, Seite 618--623. New York, NY, USA, ACM, (2005)
J. Ahn, P. Brusilovsky, D. He, J. Grady, und Q. Li. WWW '08: Proceeding of the 17th international conference on World Wide Web, Seite 1--10. New York, NY, USA, ACM, (2008)