Nilesh Bansal Fei Chiang Nick Koudas Frank Wm. Tompa Seeking Stable Clusters in the Blogosphere. 806-817 2007 conf/vldb/2007 VLDB http://www.vldb.org/conf/2007/papers/research/p806-bansal.pdf db/conf/vldb/vldb2007.html#BansalCKT07