D. Lagun, and E. Agichtein. Proceedings of the 38th International ACM SIGIR Conference on Research and Development in Information Retrieval, page 483--492. New York, NY, USA, ACM, (2015)
B. Lepri, N. Mana, A. Cappelletti, F. Pianesi, and M. Zancanaro. Proceedings of the 17th International Conference on User Modeling, Adaptation, and Personalization: formerly UM and AH, volume 5535 of UMAP '09, page 114--125. Berlin, Heidelberg, Springer-Verlag, (2009)
J. Golbeck, C. Robles, M. Edmondson, and K. Turner. Privacy, security, risk and trust (passat), 2011 ieee third international conference on and 2011 ieee third international conference on social computing (socialcom), page 149--156. IEEE, (October 2011)