Thu, 21 Aug 2008 15:27:48 BST CiteULike: bigbossman's library [508 articles] http://www.citeulike.org/user/bigbossman/article/302051 CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/bigbossman/article/302051 <i>Phys Rev E Stat Nonlin Soft Matter Phys, Vol. 67, No. 2 Pt 2. (February 2003)</i><br /><br />Many real networks in nature and society share two generic properties: they are scale-free and they display a high degree of clustering. We show that these two features are the consequence of a hierarchical organization, implying that small groups of nodes organize in a hierarchical manner into increasingly large groups, while maintaining a scale-free topology. In hierarchical networks, the degree of clustering characterizing the different groups follows a strict scaling law, which can be used to identify the presence of a hierarchical organization in real networks. We find that several real networks, such as the Worldwideweb, actor network, the Internet at the domain level, and the semantic web obey this scaling law, indicating that hierarchy is a fundamental characteristic of many complex systems. Hierarchical organization in complex networks. E Ravasz AL Barabási Phys Rev E Stat Nonlin Soft Matter Phys, Vol. 67, No. 2 Pt 2. (February 2003) 2005-08-24T02:25:07-00:00 2003 Phys Rev E Stat Nonlin Soft Matter Phys 1539-3755 67 2 Pt 2 complex hierarchy networks