L. Duan, L. Xu, F. Guo, J. Lee, and B. Yan. Information Systems, 32 (7):
978 - 986(2007)<ce:title>Special Issue on Intelligent Information Processing</ce:title>.
Y. Liu, B. Zhou, F. Chen, and D. Cheung. Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, page 489--498. New York, NY, USA, ACM, (2016)