@inbook{NBERc10898,
 Crossref = "NBERpote96-1",
 title = "Why Have Separate Environmental Taxes?",
 author = "Don Fullerton",
 BookTitle = "Tax Policy and the Economy, Volume 10",
 Publisher = "MIT Press",
 pages = "33-70",
 year = "1996",
 month = "January",
 URL = "http://www.nber.org/chapters/c10898",
}
@book{NBERpote96-1,
 title = "Tax Policy and the Economy, Volume 10",
 author = "James M. Poterba",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "1996",
 URL = "http://www.nber.org/books/pote96-1",
}