[1] The VIQR Convention ( 版) http://vietunicode.sourceforge.net/charset/viqr.html
VIQR stands for VIetnamese Quoted-Readable, which is a convention to write Vietnamese letters using 7-bit ASCII. This convention arises from the need to exchange Vietnamese messages in 7-bit environments such as email or the soc.culture.vietnamese newsgroup in the Internet. For this reason VIQR is also known as Vietnet convention.
[3] RFC 1456 - Conventions for Encoding the Vietnamese Language VISCII: VIetnamese Standard Code for Information Interchange VIQR: VIetnamese Quoted-Readable Specification () https://tools.ietf.org/html/rfc1456
[4] Vietnamese Quoted-Readable - Wikipedia, the free encyclopedia () https://en.wikipedia.org/wiki/Vietnamese_Quoted-Readable
[5] Viet-Std Report 1992 - Bilingual Report () http://vietstd.sourceforge.net/report/rep92.htm
[6] Key to character mapping "viqr" () https://chars.suikawiki.org/keys/viqr
[7] The VIQR Convention, , http://vietstd.sourceforge.net/document/viqr.htm
[9] East Asian Character Sets Overview: Vietnamese, , https://web.archive.org/web/20090107041847/http://www.massangeana.com/mas/charsets/cjk-v.htm