R. Al-Ramli, Abdullah M., and Salah Mahdi A. Al-Birmani. “Measuring and Analyzing the Investment Spending Function in the Iraqi Economy for the Period 1990-2018”. Tikrit Journal of Administrative and Economic Sciences 16, no. 52, 1 (December 31, 2020): 568–582. Accessed September 23, 2026. https://www.tjaes.org/index.php/tjaes/article/view/1785.