| [RFC2045] |  | . Freed, and . Borenstein, “Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies,” RFC, ovember 1996. http://www.ietf.org/rfc/rfc2045.txt | 
| [RFC2231] |  | N. Freed, and  Moore, “MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations,” RFC, November 1997. http://www.ietf.org/rfc/rfc2231.txt | 
| [RFC4288] |  | N. Freed, and J. Klensin, “Media Type Specifications and Registration Procedures,” RFC, December 2005. http://www.ietf.org/rfc/rfc4288.txt | 
| [RFC5987] |  | J. Reschke, “Character Set and Language Encoding for Hypertext Transfer Protocol (HTTP) Header Field Parameters,” RFC, August 2010. http://www.ietf.org/rfc/rfc5987.txt | 
| [RFC6838] |  | N. Freed, J. Klensin, and T. Hansen, “Media Type Specifications and Registration Procedures,” RFC, January 2013. http://www.ietf.org/rfc/rfc6838.txt |