@article {harsha09,
	title = {Strong Activity Rules for Iterative Combinatorial Auctions},
	journal = {Computers \& Operations Research},
	year = {2009},
	pages = {1271-1284},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/harsha09.pdf},
	author = {Pavithra Harsha and Cynthia Barnhart and David C. Parkes and Haoqi Zhang}
}
