1. Some notes on the history of protocol engineering;von Bochmann;Comput. Netw.,2010
2. Protocol specification for OSI;von Bochmann;Comput. Netw. ISDN Syst.,1989
3. Information technology—open systems interconnection—conformance testing methodology and framework;ISO/IEC,1994
4. ITU, Recommendation Z.100, ITU-T, Specification and Description Language, 1996.
5. ITU-TS, Recommendation Z.100: Specification and Description Language, 2002.