“Spectral Approximation Orders of Multidimensional Nonstationary Biorthogonal Semi-Multiresolution Analysis in Sobolev Space”. Journal of Computational Mathematics 24, no. 1 (August 15, 2018): 81–90. Accessed December 6, 2025. https://www.global-sci.com/index.php/JCM/article/view/11746.