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@inproceedings{BKSt05a, author = {Bharat Bhushan and Pascal Kurtansky and Burkhard Stiller}, title = {OSS Functions for Flexible Charging and Billing of Mobile Services in a Federated Environment.}, address = {Nice, France}, publisher = {9th IEEE/IFIP International Symposium on Network Management (IM 2005)}, month = {May}, year = {2005} }