Documents by M. Davis
1994, RFC1641: Using Unicode with MIME
1994, RFC1642: UTF-7 - A Mail-Safe Transformation Format of Unicode
1997, RFC2152: UTF-7 A Mail-Safe Transformation Format of Unicode
2006, RFC4646: Tags for Identifying Languages
2006, RFC4647: Matching of Language Tags
2009, RFC5646: Tags for Identifying Languages
2010, RFC6067: BCP 47 Extension U
2012, RFC6497: BCP 47 Extension T - Transformed Content