@inbook{NBERc6698,
 Crossref = "NBERauer99-1",
 title = "Generational Accounting and Depletable Natural Resources: The Case of Norway",
 author = "Erling Steigum, Jr and Carl Gjersem and Willi Leibfritz",
 BookTitle = "Generational Accounting around the World",
 Publisher = "University of Chicago Press",
 pages = "369-396",
 year = "1999",
 month = "January",
 URL = "http://www.nber.org/chapters/c6698",
}
@book{NBERauer99-1,
 title = "Generational Accounting around the World",
 author = "Alan J. Auerbach and Laurence J. Kotlikoff and Willi Leibfritz",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1999",
 URL = "http://www.nber.org/books/auer99-1",
}