luceen Immanuel Kework, and Dona diya butros. “Modeling and Forecasting the Volatility of Gasoline Prices Using Symmetric and Asymmetric GARCH Models in Erbil City”. QALAAI ZANIST JOURNAL, vol. 4, no. 2, June 2019, pp. 592-36, doi:10.25212/lfu.qzj.4.2.18.