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== Abstract ==
== Original document ==
The different versions of the original document can be found in:
* [http://dx.doi.org/10.5353/th_b4212813 http://dx.doi.org/10.5353/th_b4212813]
* [http://hub.hku.hk/handle/10722/55361 http://hub.hku.hk/handle/10722/55361],
: [http://hub.hku.hk/bitstream/10722/55361/3/FullText.pdf http://hub.hku.hk/bitstream/10722/55361/3/FullText.pdf],
: [https://academic.microsoft.com/#/detail/2259261396 https://academic.microsoft.com/#/detail/2259261396]
Return to 來秀菊. Loi 2012a.