@inbook{NBERc10910,
 Crossref = "NBERpote98-1",
 title = "Introduction, acknowledgment",
 author = "James M. Poterba",
 BookTitle = "Tax Policy and the Economy, Volume 12",
 Publisher = "MIT Press",
 year = "1998",
 month = "January",
 URL = "http://www.nber.org/chapters/c10910",
}
@book{NBERpote98-1,
 title = "Tax Policy and the Economy, Volume 12",
 author = "James Poterba",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1998",
 URL = "http://www.nber.org/books/pote98-1",
}