J. Cheng, L. Adamic, P. Dow, J. Kleinberg, and J. Leskovec. Proceedings of the 23rd International Conference on World Wide Web, page 925--936. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2014)
J. King, A. Lampinen, and A. Smolen. Proceedings of the Seventh Symposium on Usable Privacy and Security, page 12:1--12:20. New York, NY, USA, ACM, (2011)