P. Singer, D. Helic, A. Hotho, and M. Strohmaier. International Conference on World Wide Web, page 1003--1013. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2015)
T. Yan, D. Chu, D. Ganesan, A. Kansal, and J. Liu. International Conference on Mobile Systems, Applications, and Services, page 113--126. New York, NY, USA, ACM, (2012)