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Well, the Ulysses way of doing footnotes is either directly in the text or from the notes. Basically what you do is to write something like {{person2009}} in the text where you want to see the reference and then in the notes you write {{person2009-This is the footnote}}. During export you can then either have them exported to LaTeX, rtf or pdf. And in most cases you can also see them as endnotes or footnotes.
Though I believe this is a nice way, I can understand that it may become messy with massive amounts of footnotes. I have a idea on how to solve this and just submitted it for review to our bug tracker.
We'll definitely have a look into that.
Just to make sure I understand you right: you basically want a separate tag for footnotes and endnotes (which are here used as references), right? I think this will be possible.
Currently, the ePub Exporter is quite limited in exporting references for scientific publishing. However, this was never the real focus. It seems that you have some specific ideas regarding academic writing using ePub in mind, so why don't you contact us directly at support@the-soulmen.com and maybe we can help you in your specific case.
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