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http://pdfs.semanticscholar.org/78f9/e19f44dc0ea6abf54b81f153a885def49440.pdf
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http://www.nature.com/article-assets/npg/srep/2014/140728/srep05855/extref/srep05855-s1.pdf
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http://www.socolar.com/Article/Index?aid=200269485519&jid=200000073720
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http://www.onacademic.com/detail/journal_1000037086231510_b289.html
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