Sultan, Wafaa Ali, and Zainab shalal akaer. “Evaluating the Efficiency of Investments in Insurance Companies Analytical Study in a Sample of Qatari Insurance Companies”. Tikrit Journal of Administrative and Economic Sciences, vol. 17, no. 54, 1, June 2021, pp. 244-63, doi:10.25130/tjaes.17.54.1.15.