Symmetry Groupoids and Patterns of Synchrony in Coupled Cell Networks Stewart Golubitsky Pivato 2003

This is the groupoid paper, taking you step by step into how to be a groupoid expert. Unfortunately, i had a good six months of prereqs (spec. group theory) before I was going to be qualified to understand even a small fraction of what this paper had to share. In short, i didn't really read it. But here it is.