@conference {papaioannou2002accounting,
	title = {Accounting Architecture for QoS-differentiated VPN},
	booktitle = {From QoS Provisioning to QoS Charging:... COST 263 International Workshop on Quality of Future Internet Services, QofIS... and... International Workshop on Internet Charging and QoS Technologies, ICQT...: Proceedings},
	year = {2002},
	pages = {250},
	publisher = {Springer},
	organization = {Springer},
	author = {Papaioannou, Thanasis G and Stamoulis, George D}
}
