Complete Reference/Merging

I want to use End Note to manage my PDF libary.

To that end, I imported about 1,000 pdfs into it. It only recognized the DOIs for 7 of them.

So now I have “blank” records containing only the PDFs.

My general question is: How do I get the complete citation information for each of these?

I’ve tried several ways to accomplish this, but haven’t yet solved the problem.

I’d like to either open the blank reference, and somehow get the correct info off the web quickly, or download the new info and force merge the two references.

Am I out of luck?