Konstantinos Stamos George Pallis Athena Vakali Marios D. Dikaiakos Evaluating the utility of content delivery networks. 11-20 2009 UPGRADE-CN http://doi.acm.org/10.1145/1552486.1552509 conf/hpdc/2009upgrade db/conf/hpdc/upgrade2009.html#StamosPVD09