@inbook{NBERc9093,
 Crossref = "NBERsmit77-1",
 title = "Front matter to "Explorations in Economic Research, Volume 4, number 2"",
 author = "",
 BookTitle = "Explorations in Economic Research, Volume 4, number 2",
 Publisher = "NBER",
 year = "1977",
 month = "June",
 URL = "http://www.nber.org/chapters/c9093",
}
@book{NBERsmit77-1,
 title = "Explorations in Economic Research, Volume 4, number 2",
 author = "NBER",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1977",
 URL = "http://www.nber.org/books/smit77-1",
}