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2. BCBC 2008 Determination of the December 2007 Peak in Economic Activity http://www.NBER.org/cycles/dec2008/html
3. BCDC 2001 The Business-Cycle Peak of March 2001 http://www.NBER.org/cycles/November2001/html
4. Braun , Phillip Victor Zarnowitz 1992 Twenty-two years of the NBER-ASA quarterly economic outlook surveys: Aspects and comparisons of forecasting performance
5. Techniques for testing the constancy of regression relationships over time;Brown;Journal of the Royal Statistical Society, Series B,1975