http://pdfs.semanticscholar.org/8be8/8cb0c5a53cd77d7509d579e95d8317456925.pdf
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http://www.onacademic.com/detail/journal_1000034867966810_2c63.html
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http://www.xueshufan.com/publication/2108662565
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http://europepmc.org/articles/PMC3400789/pdf/zdd1538.pdf
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http://dmd.aspetjournals.org/content/40/8/1538.full-text.pdf
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