1. Adamic, L. & Glance, N. (2005). The political blogosphere and the 2004 U.S. election: Divided they blog. Retrieved October 27, 2008, from http://www.blogpulse.com/papers/ 2005/AdamicGlanceBlogWWW.pdf.
2. Emergence of scaling in random networks;Barabasi;Science,1999