Novella Bartolini Emiliano Casalicchio Salvatore Tucci A Walk through Content Delivery Networks. 1-25 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2965&spage=1 2003 conf/mascots/2003t MASCOTS Tutorials db/conf/mascots/mascotst2003.html#BartoliniCT03a