@techreport{NBERw13358,
 title = "Prescription Drug Coverage and Elderly Medicare Spending",
 author = "Baoping Shang and Dana P. Goldman",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13358",
 year = "2007",
 month = "September",
 URL = "http://www.nber.org/papers/w13358",
}