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Follow-up to #1778534: Add the "original-source" meta tag to add the publication-source meta tag (details on http://googlenewsblog.blogspot.com/2010/11/credit-where-credit-is-due.html).
A) It's "syndication-source", not "publication-source".
B) Upon re-reading the Google article, I don't think it's needed - they recommend to use the canonical URL meta tag instead.
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