Tiwari, A. K., Islam, F., Bolat, S., Kyophilavong, P., & Kim, B. (2017). The Stationary of Productivity Shocks: Evidence from 25 OECD and Big 7 Countries. International Journal of Economics and Financial Issues, 7(1), 613–618. Retrieved from https://econjournals.com/index.php/ijefi/article/view/3781