@inbook{NBERc9785,
 Crossref = "NBERfeld88-4",
 title = "Inroduction. International Economic Cooperation",
 author = "Martin S. Feldstein",
 BookTitle = "International Economic Cooperation",
 Publisher = "University of Chicago Press",
 pages = "1-10",
 year = "1988",
 URL = "http://www.nber.org/chapters/c9785",
}
@book{NBERfeld88-4,
 title = "International Economic Cooperation",
 author = "Martin Feldstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1988",
 URL = "http://www.nber.org/books/feld88-4",
}