F. Figueiredo, B. Ribeiro, J. Almeida, and C. Faloutsos. International Conference on World Wide Web, page 695--706. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2016)
S. Feng, X. Li, Y. Zeng, G. Cong, Y. Chee, and Q. Yuan. Proceedings of the 24th International Conference on Artificial Intelligence, page 2069--2075. AAAI Press, (2015)