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http://www.scirp.org/(S(01bd3gyiwyc4yk555oddh345))/journal/PaperDownload.aspx?FileName=ChnStd_2013022717183064.pdf&paperID=28384
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http://www.ljemail.org/journal/PaperDownload.aspx?FileName=ChnStd_2013022717183064.pdf&paperID=28384
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http://dx.doi.org/10.4236/chnstd.2013.21002
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http://file.scirp.org/pdf/ChnStd_2013022717183064.pdf
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