Wadullah Saleem, Wisam. “Using The Biorthogonal Wavelet to Address the Problem Heterogeneity of Variance”. Statistics, Optimization & Information Computing 15, no. 4 (February 5, 2026): 3085-3100. Accessed April 9, 2026. http://www.iapress.org/index.php/soic/article/view/3209.