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Lutz, D J; Lamp, D; Mandic, P; Hecht, F; Stiller, B (2010). Charging of SAML-based federated VoIP services. In: 5th International Conference for Internet Technology and Secured Transactions (ICITST-2010), London, U.K., 8 November 2010 - 11 November 2010, 1-8.