Y. Wu, Y. Yao, F. Xu, H. Tong, and J. Lu. Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, page 2287--2292. New York, NY, USA, ACM, (2016)
X. Shi, H. Huang, S. Zhao, P. Jian, and Y. Tang. Database Systems for Advanced Applications, page 420--424. Cham, Springer International Publishing, (2019)