PaperPile is a Google Doc add-on. It can be used to look up and insert citations while you work in Google Docs. This page is dedicated to the free add-on for Google Docs, not the paid version of the web app.
To install the PaperPile Add-On in your Google Docs:
To open and work in PaperPile
Visit the PaperPile cheat sheet for information on how to search and cite.