[HTML 4.01 Specification (1999) (awaiting validation)]
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[IETF RFC 1034 (1987) (awaiting validation)]
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[IETF RFC 1035 (1987) (awaiting validation)]
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[IETF RFC 3403 (2002) (awaiting validation)]
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[IETF RFC 3454 (2002) (awaiting validation)]
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[IETF RFC 3490 (2003) (awaiting validation)]
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[IETF RFC 3492 (2003) (awaiting validation)]
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[IETF RFC 4033 (2005) (awaiting validation)]
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[IETF RFC 5155 (2008) (awaiting validation)]
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[Standard, 5.2 (awaiting validation)]
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