Hello,
I just read your message dating back from 2016.
I have made recently an interesting observation for batch retrieving large number of references from their accession number (PMID) with Endnote X9.
Simply paste the numbers list (each number separated by a return symbol) in the search field “PMID” when searching Pubmed and the list of references appears in the search output.
This is quite simple and useful. I have transmitted the tip to Endnote people.
D. Sanglard