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The 6 June 2010 edit to this article included a table apparently copied from a textbook (parts of which can be found online) then slightly altered. I'm trying to find this source to determine appropriate attribution. Nfette (talk) 04:56, 2 December 2011 (UTC)
The most recent edit to this article added an external link. I'm trying to determine if link complies with Wikipedia policy on licensing. Nfette (talk) 04:55, 3 December 2011 (UTC)