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2. Google Blog Search,
http://blogsearch.google.co.jp/
3. Technorati,
http://www.technorati.jp/
4. Fujimura, K., Inoue, T., Sugisaki, M.: The EigenRumor Alogorithm for Ranking Blogs. In: WWW 2005 2nd Annual Workshop on the Weblogging Ecosystem: Aggregation, Analysis and Dynamics (2005)
5. Kritikopoulos, A., Sideri, M., Varlamis, I.: BlogRank: Ranking Weblogs Based on Connectivity and Similarity Features. In: AAA-IDEA (2006)