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@techreport{SFPW98a,
author = {Burkhard Stiller and George Fankhauser and Bernhard Plattner and Nathalie Weiler},
title = {Pre-study on Customer Care, Accounting, Charging, Billing, and Pricing},
institution = {TIK Laboratory, ETH Zurich},
month = {Jan},
year = {1998}
}