@conference {papaioannou2002design,
	title = {Design and Implementation of a Charging and Accounting Architecture for QoS-differentiated VPN Services to Mobile Users},
	booktitle = {ICQT{\textquoteright}02 Workshop, Lecture Notes in Computer Science},
	volume = {2511},
	year = {2002},
	pages = {250{\textendash}262},
	publisher = {Berlin: Springer-Verlag, 1973-},
	organization = {Berlin: Springer-Verlag, 1973-},
	author = {Papaioannou, T.G. and Stamoulis, GD}
}
