From QoS Provisioning to QoS Charging : Third COST 263 International Workshop on Quality of Future Internet Services, QofIS 2002, and Second International Workshop on Internet Charging and QoS Technologies, ICQT 2002, Zurich, Switzerland, October 16-18, 2002, Proceedings - Burkhard Stiller, Michael Smirnow, Martin Karsten, Peter Reichl ((Lecture Notes in Computer Science))