@inbook{NBERc5835,
 Crossref = "NBERbald84-1",
 title = "The U.S. Generalized System of Preferences and Its Impacts",
 author = "Andr� Sapir and Lars Lundberg",
 BookTitle = "The Structure and Evolution of Recent U.S. Trade Policy",
 Publisher = "University of Chicago Press",
 pages = "195-236",
 year = "1984",
 URL = "http://www.nber.org/chapters/c5835",
}
@book{NBERbald84-1,
 title = "The Structure and Evolution of Recent U.S. Trade Policy",
 author = "Robert E. Baldwin and Anne O. Krueger",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1984",
 URL = "http://www.nber.org/books/bald84-1",
}