@inbook{NBERc1311,
 Crossref = "NBERuniv55-2",
 title = "Technical Change and Capital Formation",
 author = "Abbott Payson Usher",
 BookTitle = "Capital Formation and Economic Growth",
 Publisher = "Princeton University Press",
 pages = "523-550",
 year = "1955",
 URL = "http://www.nber.org/chapters/c1311",
}
@book{NBERuniv55-2,
 title = "Capital Formation and Economic Growth",
 author = "Harry Scherman, Chairman, Universities-National Bureau Committee for Economic Research",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1955",
 URL = "http://www.nber.org/books/univ55-2",
}