David Hausheer: A Generic and Modular Accounting and Charging System for Peer-to-Peer Applications; in: 14. Fachtagung Kommunikation in Verteilten Systemen 2005 (KiVS 05), Kaiserslautern, Germany, March 2005, URL: http://hausheer.osola.com/publications/KiVS-talk.pdf.