1. K.U. Heitmann, The role of communication servers in the architecture of healthcare information systems, in: J. Dudeck, B. Blobel, W. Lordieck, T. Bürkle (Eds.), New Technologies in Hospital Information Systems, IOS Press, Amsterdam, 1997, pp. 156–162.
2. CEN, Medical Informatics, Registration of Information Objects Used for EDI in Healthcare, Part 1: The Register, European Prestandard, ENV 12537-1.
3. CEN, Medical Informatics, Registration of Information Objects Used for EDI in Healthcare, Part 2: Procedures for the Registration of Information Objects Used for Electronic Data Interchange (EDI) in Healthcare, European Prestandard ENV12537-2.
4. CEN/TC 251/Medical Informatics, Messages for the Exchange of Laboratory Information, CEN ENV 1613, 1994.
5. CEN/TC 251/Medical Informatics, Methodology for the Development of Healthcare Messages, CEN/TC251 N95-026, 1995.