1. Ball, L., Leigh, D., & Loungani, P. (2013). Okun’s Law: fit at fifty. NBER WP #18668.
2. Barnes, M., Gumbau-Brisa, F., & Olivei, G. (2013). Do real-time Okun’s Law errors predict GDP data revisions? Federal Reserve Bank of Boston, Working paper 13-3.
3. Lectures on macroeconomics;Blanchard,1989
4. Is there a core of practical macroeconomics that we should all believe?;Blinder;American Economic Review,1997
5. Do professional forecasters believe in the Phillips curve? Evidence from the G7 countries;Fendel;Journal of Forecasting,2011