"The Improved Operational Matrices of DP-Ball Polynomials for Solving Singular Second Order Linear Dirichlet-type Boundary Value Problems" (2023) Hadhramout University Journal of Natural & Applied Sciences, 19(1). موجود في: https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/22 (تاريخ الوصول: 28 يوليو 2026).