@inbook{NBERc11421,
 Crossref = "NBERfrie85-1",
 title = "The Substitutability of Debt and Equity Securities",
 author = "Benjamin M. Friedman",
 BookTitle = "Corporate Capital Structures in the United States",
 Publisher = "University of Chicago Press",
 pages = "197-238",
 year = "1985",
 URL = "http://www.nber.org/chapters/c11421",
}
@book{NBERfrie85-1,
 title = "Corporate Capital Structures in the United States",
 author = "Benjamin M. Friedman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1985",
 URL = "http://www.nber.org/books/frie85-1",
}