6. 参考文献 (References)

6.1. 规范性参考文献 (Normative References)

[US-ASCII] American National Standards Institute, "编码字符集 -- 7-bit 美国信息交换标准码", ANSI X3.4, 1986.

[RFC733] Crocker, D., Vittal, J., Pogran, K., and D. Henderson, "ARPA 网络文本消息格式标准", RFC 733, November 1977.

[RFC822] Crocker, D., "ARPA Internet 文本消息格式标准", STD 11, RFC 822, August 1982.

[RFC2234] Crocker, D. and P. Overell, "语法规范的增强型 BNF: ABNF", RFC 2234, November 1997.

[RFC4234] Crocker, D., Ed. and P. Overell, "语法规范的增强型 BNF: ABNF", RFC 4234, October 2005.

[RFC7405] Kyzivat, P., "ABNF 中区分大小写的字符串支持", RFC 7405, December 2014.