ABDULLAH MANNA, S.; HASAN JUMA, N. Stability Analysis of Steady State Solutions of Sine–Gordon Equation. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 4, n. 2, p. 11–29, 2007. DOI: 10.33899/csmj.2007.164024 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36676. Acesso em: 18 dec. 2025.