6. References (Referenzen)

6.1. Normative References

[US-ASCII] - ANSI X3.4, 1986: 7-Bit American Standard Code for Information Interchange

6.2. Informative References

[RFC733] - Standard for ARPA network text messages (1977)
[RFC822] - Standard for ARPA Internet text messages (1982)
[RFC2234] - Augmented BNF for Syntax Specifications (1997)
[RFC4234] - Vorgänger von RFC 5234 (2005)
[RFC7405] - Case-Sensitive String Support in ABNF (2014)