1. Alexopoulos, M., Cohen, J., 2009. Uncertain Times, Uncertain Measures. Working Paper, No. 352. University of Toronto.
2. The stock market and investment;Barro;Review of Financial Studies,1990
3. Irreversibility, uncertainty and cyclical investment;Bernanke;Quarterly Journal of Economics,1983
4. The impact of uncertainty shocks;Bloom;Econometrica,2009
5. Uncertainty and investment dynamics;Bloom;Review of Economic Studies,2007