@inbook{NBERc10010,
 Crossref = "NBERaesm74-1",
 title = "Optimal Stable Policies for Unstable Instruments",
 author = "Christopher A. Sims",
 BookTitle = "Annals of Economic and Social Measurement, Volume 3, number 1",
 Publisher = "",
 pages = "257-266",
 year = "1974",
 URL = "http://www.nber.org/chapters/c10010",
}
@book{NBERaesm74-1,
 title = "Annals of Economic and Social Measurement, Volume 3, number 1",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "",
 year = "1974",
 URL = "http://www.nber.org/books/aesm74-1",
}