R. Gao, M. Zhao, T. Ye, F. Ye, Y. Wang, K. Bian, T. Wang, и X. Li. Proceedings of the 20th Annual International Conference on Mobile Computing and Networking, стр. 249--260. New York, NY, USA, ACM, (2014)
L. Backstrom, и J. Kleinberg. Proceedings of the 17th ACM Conference on Computer Supported Cooperative Work &\#38; Social Computing, стр. 831--841. New York, NY, USA, ACM, (2014)