@inbook{NBERc9871,
 Crossref = "NBERcutl04-1",
 title = "Benefit Plan Design and Prescription Drug Utilization Among Asthmatics: Do Patient Copayments Matter?",
 author = "William H. Crown and Ernst R. Berndt and Onur Baser and Stan N. Finkelstein and Whitney P. Witt and Jonathan Maguire and Kenan E. Haver",
 BookTitle = "Frontiers in Health Policy Research, Volume 7",
 Publisher = "MIT Press",
 pages = "95-128",
 year = "2004",
 month = "July",
 URL = "http://www.nber.org/chapters/c9871",
}
@book{NBERcutl04-1,
 title = "Frontiers in Health Policy Research, Volume 7",
 author = "David M. Cutler and Alan M. Garber",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "2004",
 URL = "http://www.nber.org/books/cutl04-1",
}