Siham Yousaf Ali , Abdallah Ibrahim NurAldeen. “An Estimation of Import Demand Function for Wheat in Libya(1980-2016) Empirical Study Using Simultaneous Integration With Thresholds (Co-Integration With Regime Shift )”. Journal of Pure & Applied Sciences 17, no. 3 (December 31, 2018). Accessed July 22, 2026. https://sebhau.edu.ly/journal/jopas/article/view/281.