@conference {constantin09,
	title = {An Online Mechanism for Ad Slot Reservations with Cancellations},
	booktitle = {Proc. ACM-SIAM Symposium on Discrete Algorithms (SODA{\textquoteright}09)},
	year = {2009},
	pages = {1265{\textendash}1274},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/soda09.pdf},
	author = {Florin Constantin and Jon Feldman and S. Muthukrishnan and Martin Pal}
}
