http://www.onacademic.com/detail/journal_1000039689073910_9341.html
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http://www.tandfonline.com/doi/pdf/10.1080/21681392.2016.1245104?needAccess=true
Taylor & Francis
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http://core.ac.uk/download/pdf/84365107.pdf
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http://helda.helsinki.fi/bitstream/10138/192772/1/21681392.2016.pdf
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http://tuhat.helsinki.fi/portal/services/downloadRegister/85774792/21681392.2016.pdf
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