Hi John, Its now working, it turns out the version of pdftotext that I was using wasn’t working well. I found different version (http://macappstore.org/pdftotext/ ) that did the trick cheers, M > On Dec 23, 2015, at 4:30 PM, John Kitchin wrote: > > Thanks! Do you know if you have pdftotext working on your machine? The pdf drag-n-drop works by converting the pdf to text, and than matching a pattern to find a doi. If none is found, you get the message you noted. The url dnd works similarly, but there are a bunch of recipes for what to match depending on the base of the url. > > I did that on a Mac, and I haven't tested it on a windows or Linux machine. > > John > > ----------------------------------- > Professor John Kitchin > Doherty Hall A207F > Department of Chemical Engineering > Carnegie Mellon University > Pittsburgh, PA 15213 > 412-268-7803 > @johnkitchin > http://kitchingroup.cheme.cmu.edu > > > On Wed, Dec 23, 2015 at 4:22 PM, marvin doyley > wrote: > Hi John, > > I am playing with org-ref, the melpa version. > > Everything works fine except, one thing. When I drag a pdf to an empty bibtex file it doesn’t extract the doi ( no doi found in the file:/// <>). I tried it pdf you used in your video (Examples of Effective Data Sharing in Scientific Publishing), but I got the same error. Dragging the url to the bibtex file also doesn’t works for me. > > cheers, > M > > PS by the way, your video was excellent :) >