فرحان عقيل حميد. “Using Dickey _ Fuller Expanded Test for Testing Variables of Investment Function in Iraq”. Journal of Economics and Administrative Sciences 25, no. 114 (October 1, 2019): 1–19. Accessed March 28, 2025. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/1752.