Hello Alan,
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				Why would an Indonesian academic publish in English? It doesn't make sense ---well, to me it doesn't make sense.
			
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 Well, academia worldwide publishes in English, especially if it wants to make any impact. Partly, because publications in other languages tend to get ignored, partly because it confers a bit of status over publishing the same paper in an "odd" language, and last not least because the major journals only accept MSs in English...
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				I will not try to contact the author, I'd just as soon not incur a debt.
			
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 Theoretically, in academia this would be regarded as obligation rather than something which incurs a debt. I'm aware that this probably would be seen a bit differently in some countries and circles though... 
Regards,
Kai