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References are quite important but it would probably be easier to handle them before uploading the document to the device. Journal databases are already capable of exporting citation information and if the software used to upload your documents supports it, it could keep a database of all the documents on the device (including citation information and possibly other stuff like where was it downloaded from, to which project is it related to, other notes etc.)
It is also my experience that complete citation info is not always available in the pdf anyway (metadata or no) and personally I prefer to store that info when I download a paper (even if I won't need it) rather than trying to find it later.
Nevertheless the capability of properly handling citations is useful only if you are going to prepare documents on that platform and to be honest I never felt like doing that on the go. Personally I prefer my PC for that since it's easier to type in a normal keyboard and I have access to other useful software for creating graphs and images as well as for data analysis.
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