عبد الحسين هناء, and عطية قحطان لفته. “Measuring and Analysis of Demand Function on Oil Derivatives of A Selected Countries the Period 1985- 2008”. Journal of Economics and Administrative Sciences 17, no. 64 (December 1, 2011). Accessed May 1, 2025. https://www.jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/928.