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Blobel, Bernd and Pharow, Peter (2001) The Need and Practice of User Authentication and TTP Services in Distributed Health Information Systems. In: Dupuy, Michel and Paradinas, Pierre, (eds.) Trusted Information: The New Decade Challenge. IFIP International Federation for Information Processing, 65. Springer US, Berlin, pp. 61-76. ISBN 0-7923-7389-8.