The Improved Operational Matrices of DP-Ball Polynomials for Solving Singular Second Order Linear Dirichlet-type Boundary Value Problems. HADHRAMOUT JOURNAL OF MEDICAL SCIENCES. 2023;19(1). تاريخ الوصول يوليو 28, 2026. https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/22