Modeling and Forecasting Volatility of Qatar Stock Exchange in light of the blockade and Covid-19 crises Using GARCH Models. renaf [انترنت]. 1 يوليو، 2025 [وثق 22 أكتوبر، 2026];18(30):43-60. موجود في: https://journals.univ-chlef.dz/index.php/renaf/article/view/266