Bernd Blobel Peter Pharow Kjeld Engel Volker Spiegel Rolf Krohn Communication Security in Open Health Care Networks. 291-296 1999 MIE https://doi.org/10.3233/978-1-60750-912-7-291 conf/mie/1999 db/conf/mie/mie1999.html#BlobelPESK99