@article {Polgreen:2008,
	title = {Using Internet Searches for Influenza Surveillance},
	journal = {Clinical Infectious Diseases},
	volume = {47},
	year = {2008},
	pages = {1443{\textendash}1448},
	url = {http://econcs.seas.harvard.edu/files/econcs/files/influenza_almost_final_copy.pdf},
	author = {Philip M. Polgreen and Yiling Chen and David M. Pennock and Forrest D. Nelson}
}
