Papers/material on multi-agent systems? • /r/MachineLearning

I am very interested in reinforcement-settings in a multi-agent system. I have a hard time finding papers about reinforcement learning of sophisticated multi-agent settings, such as having a small society of agents which can trade goods with each other or interact in some other way. Is there even work in that direction? The "clostest" thing which interests me are predator-prey models. When searching for them I found a few interesting ones.