الناصر عبدالمجيد حمزة, and محمود سحر طارق. “Some Robust Methods for Estimates the Power Spectrum in ARMA Models Simulation Study”. Journal of Economics and Administrative Sciences 23, no. 97 (June 1, 2017): 358. Accessed May 2, 2025. https://www.jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/315.