R. Mihalcea, and A. Csomai. Proceedings of the Sixteenth ACM Conference on Conference on Information and Knowledge Management, page 233--242. New York, NY, USA, ACM, (2007)
W. Shen, J. Wang, P. Luo, and M. Wang. Proceedings of the 19th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 68--76. New York, NY, USA, ACM, (2013)
R. Zafarani, and H. Liu. Proceedings of the 19th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 41--49. New York, NY, USA, ACM, (2013)