Hi Marc,

Thanks for your input. I have been using Zotero as a reference system (mainly because is free) but is somewhat cumbersome to work with. I have used Endnote before (during my masters) and it was very good. What you mention makes sense, I study an interdisciplinary field where I use and re-use papers all the time. Right now I have made a folder named All PhD references and that is where I keep all of them. Within that folder I made another folder that includes some more specific-topic papers that serve as support for the other references. I will try suggestion #2, it might help clear my head as I get overwhelmed by all the different concepts involved in a project.

ZFF