AL-HAYANI, W.; J. AHMED, M. The Homotopy Perturbation Method to Solve Initial Value Problems of First Order with Discontinuities. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 16, n. 2, p. 61–70, 2022. DOI: 10.33899/csmj.2022.176592. Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36860. Acesso em: 13 oct. 2025.