@inbook{NBERc5821,
 Crossref = "NBERauer87-1",
 title = "An Overview of Takeover Defenses",
 author = "Richard S. Ruback",
 BookTitle = "Mergers and Acquisitions",
 Publisher = "University of Chicago Press",
 pages = "49-68",
 year = "1987",
 URL = "http://www.nber.org/chapters/c5821",
}
@book{NBERauer87-1,
 title = "Mergers and Acquisitions",
 author = "Alan J. Auerbach",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1988",
 URL = "http://www.nber.org/books/auer87-1",
}