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@inproceedings{SGHR01a, author = {Burkhard Stiller and Jan Gerke and Peter Reichl and Hasan Hasan and Placi Flury}, title = {Charging for Differentiated Internet Services}, address = {Denver, Colorado, U.S.A.}, booktitle = {Convergence of Information Technology and Communications, ITCOM01}, pages = {244--250}, publisher = {SPIE}, volume = {4526}, month = {Aug}, year = {2001} }