@inbook{NBERc11764,
 Crossref = "NBERlern09-1",
 title = "File Sharing and Copyright",
 author = "Felix Oberholzer-Gee and Koleman Strumpf",
 BookTitle = "Innovation Policy and the Economy, Volume 10",
 Publisher = "University of Chicago Press",
 pages = "19-55",
 year = "2010",
 month = "February",
 URL = "http://www.nber.org/chapters/c11764",
}
@book{NBERlern09-1,
 title = "Innovation Policy and the Economy, Volume 10",
 author = "Josh Lerner and Scott Stern",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2010",
 URL = "http://www.nber.org/books/lern09-1",
}