http://research-information.bris.ac.uk/ws/files/91792899/FullReport_hta20810.pdf
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http://pdfs.semanticscholar.org/dcd3/34d804c8af39738b0e830214decec2ec2086.pdf
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http://orca-mwe.cf.ac.uk/96233/1/FullReport-hta20810.pdf
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http://orca.cf.ac.uk/96233/1/FullReport-hta20810.pdf
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http://www.xueshufan.com/publication/2553805777
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http://research-information.bristol.ac.uk/files/91792899/FullReport_hta20810.pdf
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