Guowei Liu Yong Yu Jie Han Gui-Rong Xue China Web Graph Measurements and Evolution. 668-679 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3399&spage=668 2005 conf/apweb/2005 APWeb db/conf/apweb/apweb2005.html#LiuYHX05