Al-Nuaimi, S. M. O. and Hamood, M. N. (2026) “RISK-ADJUSTED PERFORMANCE EVALUATION OF INVESTMENT PORTFOLIOS USING THE INFORMATION RATIO AND TESTING THEIR EFFICIENCY: AN APPLIED ANALYTICAL STUDY OF A SAMPLE OF INVESTMENT FUNDS LISTED IN SOME GULF COOPERATION COUNCIL COUNTRIES”, Kyzylorda Scholarly Review, 3(4), pp. 193–206. Available at: https://bulletin.ouk.kz/index.php/bulletin/article/view/112 (Accessed: 28 September 2026).