Y. Ye, Y. Zheng, Y. Chen, J. Feng, and X. Xie. International Conference on Mobile Data Management: Systems, Services and Middleware (MDM), page 1--10. IEEE, (2009)
T. Hu, R. Song, Y. Wang, X. Xie, and J. Luo. Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, page 569--578. New York, NY, USA, ACM, (2016)