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== Abstract ==3
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== Original document ==8
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The different versions of the original document can be found in:10
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* [http://dx.doi.org/10.5353/th_b3126813 http://dx.doi.org/10.5353/th_b3126813]12
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* [http://hub.hku.hk/handle/10722/37547 http://hub.hku.hk/handle/10722/37547],14
: [https://academic.microsoft.com/#/detail/147707827 https://academic.microsoft.com/#/detail/147707827]15
Return to Li 李德敏. 2012a.
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