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4. C. Burger and F. Sembach. A survey of mechanisms for computer supported cooperation (in german). Technical Report 7, Universität Stuttgart, Fakultät für Informatik, July 1994.
5. German DIN. A structural specification of the ODP trader with federating included. Technical Report N1–21.1.1/55–92, ISO/IEC JTC1/SC21/WG7, 1992.