AL-NUAIMI, S. M. O.; HAMOOD, M. N. 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, [S. l.], v. 3, n. 4, p. 193–206, 2026. Disponível em: https://bulletin.ouk.kz/index.php/bulletin/article/view/112. Acesso em: 28 sep. 2026.