Wang, W., L. Duan, A. Koul, and A. Sheth. “YouRank: Let User Engagement Rank Microblog Search Results”. Proceedings of the International AAAI Conference on Web and Social Media, vol. 8, no. 1, May 2014, pp. 619-22, doi:10.1609/icwsm.v8i1.14576.