@inbook{NBERc1750,
 Crossref = "NBERlaby80-1",
 title = "Modeling International Trade Flows in Mineral Markets, with Implications for Latin America",
 author = "Frederick R. Demler and John E. Tilton",
 BookTitle = "Commodity Markets and Latin American Development -- A Modeling Approach",
 Publisher = "UMI",
 pages = "85-120",
 year = "1980",
 URL = "http://www.nber.org/chapters/c1750",
}
@book{NBERlaby80-1,
 title = "Commodity Markets and Latin American Development -- A Modeling Approach",
 author = "Walter C. Labys and M. Ishaq Nadiri and Jose Nunez Del Arco",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1980",
 URL = "http://www.nber.org/books/laby80-1",
}