@conference {55946, title = {Learning with more than rewards: The Implicit Signalling of Distributed Punishment}, booktitle = {Proceedings of 11th International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2012).}, year = {2012}, month = {June}, pages = {2579{\textendash}2586}, isbn = {978-0-9817381-2-3}, author = {Villatoro, D. and Andrighetto, G. and Brandts, J. and J. Sabater-Mir and Conte, R.} }