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@techreport{SDBB99, author = {Burkhard Stiller and G Dermler and Torsten Braun and D Billard}, title = {Approaches for the Integration of Charging and Accounting into Internet Models and VPN}, institution = {ETH Zuerich. Deliverable CATI-TIK-DN-P-006-1.2}, month = {Jan}, year = {1999} }