S. M.Gargari, and S. Oguducu. Proceedings of the 2012 International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2012), page 827--834. Washington, DC, USA, IEEE Computer Society, (2012)
M. Noll, C. man Au Yeung, N. Gibbins, C. Meinel, and N. Shadbolt. Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval, page 612--619. New York, NY, USA, ACM, (2009)