ABD ALLA IBRAHEM AHMED F, RAHAMTALLA KHEDIR GENAWI K. Environmental-Adjusted Operational Efficiency Analysis of Insurance Companies: An Application of the Three-Stage Data Envelopment Analysis Model. oiujas [انترنت]. 14 سبتمبر، 2025 [وثق 3 نوفمبر، 2026];21(3):65-87. موجود في: https://journal.oiu.edu.sd/oiujas/article/view/3397