==Copyvios== 
 I'm seeing entire sentences and paragraphs copied either verbatim or with very minor changes from multiple sources.  Ref. 21 is particularly egregious, but I've also found copyvios from Ref .7 and REf. 9.   please have a look at Wikipedia:Close paraphrasing and Wikipedia:Copying text from other sources.  You can't copy-paste text from copyrighted sources, even if you make small changes to it; you need to write in your own words.  This article will need to be substantially rewritten if it is to retain its GA status.  (⁄)