Saving somebody 10 seconds, here is Bacon's paper:
That said, I'm reading this paper now. It's absolutely fascinating and very approachable. Well worth checking out.
For anyone that still wants to read it, here's a citation -- you can easily find a copy by searching for the title of the paper.
Bacon, David F., Perry Cheng, and V. T. Rajan.
"A Unified Theory of Garbage Collection."
Convergence 6, no. 17 (2004): 32.