جواد لميعة باقر, and عبد الله لمياء طه. “Wavelet Analysis For Sunspot Time Series”. Journal of Economics and Administrative Sciences 13, no. 45 (March 1, 2007): 273. Accessed March 29, 2025. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/1138.