@conference {constantin08,
	title = {Online Ad Slotting With Cancellations},
	booktitle = {Proceedings of the Fourth Workshop on Ad Auctions},
	year = {2008},
	address = {Chicago, IL},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/onlineadslottingwithcancellations.pdf},
	author = {Florin Constantin and Jon Feldman and S. Muthukrishnan and Martin Pal}
}
