Nonexistence of Voting Rules That Are Usually Hard to Manipulate

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\begin{bibtex} @inproceedings{DBLP:conf/aaai/ConitzerS06, title={Nonexistence of Voting Rules That Are Usually Hard to Manipulate}, year={2006}, crossref={DBLP:conf/aaai/2006}, booktitle={AAAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/aaai/aaai2006.html#ConitzerS06}, author={Vincent Conitzer and Tuomas Sandholm} }\end{bibtex}