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Happy editing! Qwfp (talk) 18:32, 19 July 2009 (UTC)
In this edit you suggested that the article contains "original research", but you never specified on the talk page or elsewhere just what you had in mind. The article looks to me like standard textbook material that I've seen and taught in classrooms. Specifically what within the article looked to you like original research? Michael Hardy (talk) 14:46, 2 May 2010 (UTC)