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 4, no. 2 (June 30, 2019): 592–636. Accessed July 22, 2024. https://journal.lfu.edu.krd/ojs/index.php/qzj/article/view/142.