@inproceedings { anh13,
	booktitle = {in Proc. of 23rd International Joint Conference on Artificial Intelligence (IJCAI 2013), AAAI Press},
	keywords = {Game Theory;Multi-Agent Societies;Miscellaneous;},
	title = {Why is it so hard to say sorry? Evolution of Apology with Commitment in the Iterated Prisoner’s Dilemma},
	volume = {in press},
	year = {2013},
	author = {Han The Anh and Luis Moniz Pereira and Francisco C. Santos and Tom Lenaerts}
}