Al-qalawi, Usama, Anas AlQudah, Ahmad A. Alwaked, and Arqam Abdul Razzaq Al-Rabbaie. “The Efficiency of Defense-Augmented Production Function for G20 Countries: An Analysis of the Relationship With Country Fragile Index”. International Journal of Innovative Research and Scientific Studies 8, no. 2 (April 16, 2025): 4054–4064. Accessed June 23, 2025. http://www.ijirss.com/index.php/ijirss/article/view/6230.