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@article{SGFR00a, author = {Burkhard Stiller and Jan Gerke and Peter Reichl and Placi Flury}, title = {A Generic and Modular Internet Charging System for the Cumulus Pricing Scheme}, journal = {Journal of Network and Systems Management}, number = {9}, pages = {293--325}, volume = {3}, month = {Sep}, year = {2001} }