Z. Wu, B. Tan, R. Duan, Y. Liu, and R. Mong Goh. Proceedings of the 2015 International ACM Recommender Systems Challenge, page 12:1--12:4. New York, NY, USA, ACM, (2015)
R. Wetzker, C. Zimmermann, C. Bauckhage, and S. Albayrak. Proceedings of the third ACM international conference on Web search and data mining, page 71--80. New York, NY, USA, ACM, (2010)
J. Wang, Y. Zhang, C. Posse, and A. Bhasin. Proceedings of the 22nd international conference on World Wide Web, page 1377--1388. International World Wide Web Conferences Steering Committee, (2013)