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5. Blobel, B.; Pharow, P.; Engel, K.; Spiegel, V.; Krohn, R.: Communication Security in Open Health Care Network. In: P. Kokol, B. Zupan, J. Stare, M. Premnik, R. Engelbrecht (Ed.): Medical InformaticsEurope’ 99, Series in Health Technology and Informatics, Vol. 68, IOS Press, Amsterdam, S. 291–296.