@conference {walsh09,
	title = {Automated Channel Abstraction for Advertising Auctions},
	booktitle = {Proceedings of the Ad Auctions Workshop},
	year = {2009},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/walsh09.pdf},
	author = {William E. Walsh and Craig Boutilier and Tuomas Sandholm and Rob Shields and George Nemhauser and David C. Parkes}
}
