@inbook{NBERc6181,
 Crossref = "NBERfeen89-1",
 title = "U.S.-Canada Bilateral Tariff Elimination: The Role of Product Differentiation and Market Structure",
 author = "Drusilla K. Brown and Robert M. Stern",
 BookTitle = "Trade Policies for International Competitiveness",
 Publisher = "University of Chicago Press",
 pages = "217-254",
 year = "1989",
 URL = "http://www.nber.org/chapters/c6181",
}
@book{NBERfeen89-1,
 title = "Trade Policies for International Competitiveness",
 author = "Robert C. Feenstra",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1989",
 URL = "http://www.nber.org/books/feen89-1",
}