D. Yang, P. Rosso, B. Li, and P. Cudre-Mauroux. Proceedings of the 25th ACM SIGKDD International Conference on Knowledge Discovery & Data Mining - KDD '19, page 1162--1172. Anchorage, AK, USA, ACM Press, (2019)
J. Tang, M. Qu, M. Wang, M. Zhang, J. Yan, and Q. Mei. Proceedings of the 24th International Conference on World Wide Web - WWW '15, (2015)arXiv: 1503.03578.