Al-Qassem, H., and M. Ali. “Singular Integrals Related to Homogeneous Mapping With Rough Kernels on Product Spaces”. Tamkang Journal of Mathematics 39, no. 2 (June 30, 2008): 165–176. Accessed May 3, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/27.