luceen Immanuel Kework, & Dona diya butros. (2019). Modeling and Forecasting the Volatility of Gasoline Prices Using Symmetric and Asymmetric GARCH Models in Erbil City. QALAAI ZANIST JOURNAL, 4(2), 592–636. https://doi.org/10.25212/lfu.qzj.4.2.18