@inbook{NBERc0731,
 Crossref = "NBERmoor61-1",
 title = "Cyclical Diversities in the Fortunes of Industrial Corporations",
 author = "Thor Hultgren",
 BookTitle = "Business Cycle Indicators, Vol. 1",
 Publisher = "Princeton University Press",
 pages = "325-349",
 year = "1961",
 URL = "http://www.nber.org/chapters/c0731",
}
@book{NBERmoor61-1,
 title = "Business Cycle Indicators, Vol. 1",
 author = "Geoffrey H. Moore",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1961",
 URL = "http://www.nber.org/books/moor61-1",
}