William Aiello Andrei Z. Broder Jeannette Janssen Evangelos E. Milios Workshop on Algorithms and Models for the Web Graph. 18-23 2006 WAW http://dx.doi.org/10.1007/978-3-540-78808-9_2 conf/waw/2006 db/conf/waw/waw2006.html#AielloBJM06a