ABD ALLA IBRAHEM AHMED, FADWA, و KHALID RAHAMTALLA KHEDIR GENAWI. "Environmental-Adjusted Operational Efficiency Analysis of Insurance Companies: An Application of the Three-Stage Data Envelopment Analysis Model". Journal of Omdurman Islamic University Applied Sciences 21, no. 3 (سبتمبر 14, 2025): 65–87. تاريخ الوصول نوفمبر 2, 2026. https://journal.oiu.edu.sd/oiujas/article/view/3397.