@conference {Conitzer_kr12,
	title = {Paradoxes of Multiple Elections: An Approximation Approach},
	booktitle = {Proceedings of the 13th International Conference on Principles of Knowledge Representation and Reasoning (KR-12)},
	year = {2012},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/conitzer_kr12.pdf},
	author = {Vincent Conitzer and Lirong Xia}
}
