صالح لورنس يحيى, and محمد حيدر ظاهر. “(Energy Alternatives and the Possibility of Substitution)”. Journal of Economics and Administrative Sciences 23, no. 98 (August 1, 2018): 308. Accessed May 1, 2025. https://www.jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/284.