@inproceedings{altruism,
	author = {Aris Anagnostopoulos and Luca Becchetti and Bart de Keijzer and Guido Sch{\"{a}}fer},
	title = {Inefficiency of Games with Social Context},
	booktitle = {Proceedings of the 6th International Symposium on Algorithmic Game Theory},
	series = {Lecture Notes in Computer Science},
	volume = {8146},
	editor = {Berthold  V{\"{o}}cking},
	publisher = {Springer},
	pages = {219--230},
	year = {2013} 
}