- Phys. Rev. A 36(8):4111--4114 (1987)
- (November 2008)
- W3C Recommendation, (2008)Available at http://www.w3.org/TR/REC-xml/ .
- W3C, (November 2008)
- (April 2004)
- Biological Cybernetics 69(2):119-128 (1993)
- RFC 2044 Informational, (October 1996)Obsoleted by RFC 2279 .
- RFC 2070 Historic, (January 1997)Obsoleted by RFC 2854 .
- RFC 2279 Draft Standard, (January 1998)Obsoleted by RFC 3629 .
- RFC 2781 Informational, (February 2000)
- RFC 3629 Standard, (November 2003)
- W3C Recommendation, (April 2004)
- W3C, (2004)
- World Wide Web Consortium, Working Draft WD-charmod-20030822, (August 2003)
- World Wide Web Consortium, Recommendation REC-charmod-20050215, (February 2005)
- World Wide Web Consortium, Proposed Recommendation CR-charmod-resid-20041122, (November 2004)
- World Wide Web Consortium, Working Draft charmod-norm-20051027, (October 2005)
- World Wide Web Consortium, Recommendation REC-xml-20040204, (February 2004)
- World Wide Web Consortium, Recommendation REC-xml-20060816, (August 2006)
- World Wide Web Consortium, Recommendation REC-xml-20081126, (November 2008)


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