Peter Reichl Burkhard Stiller Bruno Tuffin Network Economics for Next Generation Networks, 6th International Workshop on Internet Charging and Qos Technologies, ICQT 2009, Aachen, Germany, May 11-15, 2009. Proceedings 5539 2009 http://dx.doi.org/10.1007/978-3-642-01796-4 978-3-642-01795-7 ICQT Lecture Notes in Computer Science Springer db/conf/icqt/icqt2009.html