1. Akerlof GA, Yellen JL (1985) Unemployment through the filter of memory. Q J Econ 100:747–773
2. Baker M (1992) Unemployment duration: compositional effects and cyclical variablity. Am Econ Rev 82:313–321
3. Barro RJ (1997) Macroeconomics, 5th edn. MIT Press, Cambridge
4. Burns AF, Mitchell WC (1946), Measuring business cycles. National Bureau of Economic Research, New York
5. Carter S, Sutch R (1992) The great depression of the 1890s: new suggestive estimates of the unemployment rate. In: Ransom R (ed) Research in economic history, vol 14. JAI Press, Greenwich, pp 347–376