@inbook{NBERc2532,
 Crossref = "NBERnels59-1",
 title = "Appendix D: Absolute and Relative Measures of Merger Activity",
 author = "Ralph L. Nelson",
 BookTitle = "Merger Movements in American Industry, 1895-1956",
 Publisher = "Princeton University Press",
 pages = "170-173",
 year = "1959",
 URL = "http://www.nber.org/chapters/c2532",
}
@book{NBERnels59-1,
 title = "Merger Movements in American Industry, 1895-1956",
 author = "Ralph L. Nelson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1959",
 URL = "http://www.nber.org/books/nels59-1",
}