@inbook{NBERc7620,
 Crossref = "NBERnord72-1",
 title = "Is Growth Obsolete?",
 author = "William D. Nordhaus and James Tobin",
 BookTitle = "Economic Research: Retrospect and Prospect Vol 5: Economic Growth",
 Publisher = "NBER",
 pages = "1-80",
 year = "1972",
 URL = "http://www.nber.org/chapters/c7620",
}
@book{NBERnord72-1,
 title = "Economic Research: Retrospect and Prospect Vol 5: Economic Growth",
 author = "William D. Nordhaus and James Tobin",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1972",
 URL = "http://www.nber.org/books/nord72-1",
}