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- W21249951981 hasURL "https://doi.org/10.4236/cn.2009.12011" @default.
- W21249951981 type Location @default.
- W21249951981 hasSource S182352310 @default.
- W21249951981 hasVersion "publishedVersion" @default.
- W21249951981 isOa "true" @default.
- W21249951981 pdfUrl "http://www.scirp.org/journal/PaperDownload.aspx?paperID=917" @default.