@inbook{NBERc1935,
 Crossref = "NBERgort62-1",
 title = "Patterns and Trends in Diversification",
 author = "Michael Gort",
 BookTitle = "Diversification and Integration in American Industry",
 Publisher = "Greenwood Press",
 pages = "27-64",
 year = "1962",
 URL = "http://www.nber.org/chapters/c1935",
}
@book{NBERgort62-1,
 title = "Diversification and Integration in American Industry",
 author = "Michael Gort",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Greenwood Press",
 year = "1962",
 URL = "http://www.nber.org/books/gort62-1",
}