ABD ALLA IBRAHEM AHMED, F. ., و K. . 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, م 21, عدد 3, سبتمبر، 2025, ص 65-87, doi:10.52981/ oiujas.v21i3.3397.