Aridah, A. M. . (2014) β€œAN ECONOMIC STUDY OF ESTIMATING COST FUNCTION DATES PRODUCTION IN WADI AL-AJAL , SOUTHWESTERN LIBYA ”, Diyala Agricultural Sciences Journal , 6(1), pp. 65–75. Available at: https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/1660 (Accessed: 26 April 2026).