@inbook{NBERc11246,
 Crossref = "NBERbern99-1",
 title = "Substition over Time: Another Look at Life-Cycle Labor Supply",
 author = "Casey B. Mulligan",
 BookTitle = "NBER Macroeconomics Annual 1998, volume 13",
 Publisher = "MIT Press",
 pages = "75-152",
 year = "1999",
 month = "January",
 URL = "http://www.nber.org/chapters/c11246",
}
@book{NBERbern99-1,
 title = "NBER Macroeconomics Annual 1998, volume 13",
 author = "Ben S. Bernanke and Julio Rotemberg",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1999",
 URL = "http://www.nber.org/books/bern99-1",
}