Suman Banerjee Timothy Griffin Marcelo Pias The Interdomain Connectivity of PlanetLab Nodes. 73-82 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3015&spage=73 2004 conf/pam/2004 PAM db/conf/pam/pam2004.html#BanerjeeGP04