RFC 1522
MIME (Multipurpose Internet Mail Extensions) Part Two: Message Header Extensions for Non-ASCII Text. K. Moore. September 1993.
http://tools.ietf.org/html/rfc1522

RFC 2047
MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text. K. Moore. November 1996.
http://tools.ietf.org/html/rfc2047

RFC 2047 - Multipurpose Internet Mail Extensions (MIME) - Part 3
Describes extensions to RFC 822 to allow non-US-ASCII text data in Internet mail header fields.
http://tools.ietf.org/html/rfc2047

Tcl/Tk Extensions and Information Page
Schwartz Computer Consulting Services Tcl/Tk Extensions
http://www.schwartzcomputer.com/tcl-tk/tcl-tk.html

RFC 2046
Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types. N. Freed, N. Borenstein. November 1996.
http://tools.ietf.org/html/rfc2046

RFC 2049
Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples. N. Freed, N. Borenstein. November 1996.
http://tools.ietf.org/html/rfc2049

RFC 2048
Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures. N. Freed, J. Klensin, J. Postel. November 1996.
http://tools.ietf.org/html/rfc2048

Unicorn XSLT Processor
Unicorn Enterprises SA is a privately-owned Swiss company. It develops computer software, technologies, and solutions. The company is specialized in document management, output management, solutions for private banks, Intranet applications, XML technologies, consulting services.
http://www.unicorn-enterprises.com/products_uxt.html

RFC 2045
Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies. N. Freed, N. Borenstein. November 1996.
http://tools.ietf.org/html/rfc2045

RFC 1521
MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies. N. Borenstein, N. Freed. September 1993.
http://tools.ietf.org/html/rfc1521