@inbook{NBERc2146,
 Crossref = "NBERbry_71-1",
 title = "Foreword to "Cyclical Analysis of Time Series: Selected Procedures and Computer Programs"",
 author = "Gerhard Bry and Charlotte Boschan",
 BookTitle = "Cyclical Analysis of Time Series: Selected Procedures and Computer Programs",
 Publisher = "UMI",
 year = "1971",
 URL = "http://www.nber.org/chapters/c2146",
}
@book{NBERbry_71-1,
 title = "Cyclical Analysis of Time Series: Selected Procedures and Computer Programs",
 author = "Gerhard Bry and Charlotte Boschan",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1971",
 URL = "http://www.nber.org/books/bry_71-1",
}