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I see no link to "point reference system" nor article by that name. Is the concept explained in another article, or should the distinction between that and other systems be explained in this one? [[User:Jim.henderson|Jim.henderson]] ([[User talk:Jim.henderson|talk]]) 09:29, 16 January 2011 (UTC)
== What is a SQ_ID? ==
The article not explains neither point to a source about.
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