J. Li, P. Ren, Z. Chen, Z. Ren, and J. Ma. Proceedings of the 2017 ACM Conference on Information and Knowledge Management, page 1419--1428. New York, NY, USA, ACM Press, (2017)
J. Tang, and K. Wang. Proceedings of the Eleventh ACM International Conference on Web Search and Data Mining - WSDM \textquotesingle18, page 565--573. ACM Press, (2018)