@inbook{NBERc10919,
 Crossref = "NBERpote99-2",
 title = "Introduction, acknowledgment",
 author = "James M. Poterba",
 BookTitle = "Tax Policy and the Economy, volume 13",
 Publisher = "MIT Press",
 year = "1999",
 month = "January",
 URL = "http://www.nber.org/chapters/c10919",
}
@book{NBERpote99-2,
 title = "Tax Policy and the Economy, volume 13",
 author = "James Poterba",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1999",
 URL = "http://www.nber.org/books/pote99-2",
}