@techreport{NBERr1559,
 title = "An Aging Society:  Opportunity or Challenge?",
 author = "David M. Cutler and James M. Poterba and Louise M. Sheiner and Lawrence H. Summers",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Reprint Series",
 number = "1559",
 year = "1991",
 month = "April",
 URL = "http://www.nber.org/papers/r1559",
 abstract = {},
}