H. Kwak, C. Lee, H. Park, and S. Moon. WWW '10: Proceedings of the 19th international conference on World wide web, page 591--600. New York, NY, USA, ACM, (2010)
Y. Ahn, S. Han, H. Kwak, S. Moon, and H. Jeong. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 835--844. New York, NY, USA, ACM, (2007)
Y. Ahn, S. Han, H. Kwak, S. Moon, and H. Jeong. Proceedings of the 16th International Conference on World Wide Web, page 835--844. New York, NY, USA, ACM, (2007)