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@inproceedings{KuSti06, author = {Pascal Kurtansky and Burkhard Stiller}, title = {State of the Art Prepaid Charging for IP Services}, address = {Conference on Wired/Wireless Internet Communications (WWIC)}, booktitle = {WWIC 2006}, publisher = {LNCS, Springer}, volume = {3970}, month = {Nov}, year = {2006} }