J. AL-SAWOOR, A.; آن; A. SAMARCHI, M.; میرنا. An Application of He’s Variational Iteration Method for Solving Duffing - Van Der Pol Equation. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 10, n. 2, p. 153–163, 2025. Disponível em: https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19431. Acesso em: 5 aug. 2025.