RFC 2237 - Japanese Character Encoding for Internet Messages - Describes the ISO-2022-JP-1 encoding scheme, which is used in electronic mail, and network news. Also provides a listing of the Japanese Character Set that can be used in this encoding scheme. - http://tools.ietf.org/html/rfc2237
RFC 1468 - Japanese Character Encoding for Internet Messages - Describes the ISO-2022-JP encoding used in electronic mail and network news messages in several Japanese networks. It was first specified by and used in JUNET. The encoding is now also widely used in Japanese IP communities. - http://tools.ietf.org/html/rfc1468