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@techreport{RHKS01a, author = {Christoph Rensing and Hasan Hasan and Martin Karsten and Burkhard Stiller}, title = {A Survey on AAA Mechanisms, Protocols, and Architectures and a Policy-based Approach beyond: Ax}, institution = {TIK-ETHZ}, number = {111}, month = {May}, year = {2001} }