@inbook{NBERc2742,
 Crossref = "NBERhick57-1",
 title = "Aggregate Experience",
 author = "W. Braddock Hickman",
 BookTitle = "Corporate Bonds: Quality and Investment Performance",
 Publisher = "Princeton University Press",
 pages = "72-138",
 year = "1957",
 URL = "http://www.nber.org/chapters/c2742",
}
@book{NBERhick57-1,
 title = "Corporate Bonds: Quality and Investment Performance",
 author = "W. Braddock Hickman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1957",
 URL = "http://www.nber.org/books/hick57-1",
}