@inbook{NBERc2837,
 Crossref = "NBERmill75-1",
 title = "Input-Output Analysis and Air Pollution Control",
 author = "Robert Kohn",
 BookTitle = "Economic Analysis of Environmental Problems",
 Publisher = "NBER",
 pages = "259-274",
 year = "1975",
 URL = "http://www.nber.org/chapters/c2837",
}
@book{NBERmill75-1,
 title = "Economic Analysis of Environmental Problems",
 author = "Edwin S. Mills",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1975",
 URL = "http://www.nber.org/books/mill75-1",
}