hmm, so it is not so obvious what to do.
I am trying to find a solution to that, began using DT and now are looking for a bibliographic software (I WISH DT could do that!!! 
)
I do just occasionally use the fulltext pdf, usually I just need the abstract and citation. I can save this as .rtf into DT and import the same information into Sente/Bookends, but then this info would not be linked, but maybe that does not matter??
But in the cases where I do have the fulltext, it does matter, or maybe not. I could just look up the citation in Sente/Bookends whenever a search in DT returns a relevant paper (which could reside within DT as pdf or as rtf from the fulltext html)?
Right now I try to use Zotero, the 1.5 is a waste of time, too many problems. And forget .pdf import that works rubbish, so I use the “stable” release and try to figure out how useful it, does not seem to be too useful, but not sure yet. I could not find a way of integrating Zotero and DT as Zotero saves everything in stupid useless subfolders with nosense names, this cannot be imported in a useful manner into DT. So I would import the abstract or fulltext into DT plus importing the citation into Zotero.
That would be analog to the use of Sente/Bookend for just the citation without fulltext (only that Sente/Bookends can produce bibliography, Zotero cannot it appears).
So this matter still is a real pain in the back. DT is excellent, if you guys at DT could implement a citation feature into DT, that would make it kick ***.