Approximate Solution of Multi-Term Fractional Order Delay Differential Equations Using Homotopy Perturbation Method. Al-Nahrain Journal of Science, [S. l.], v. 23, n. 2, p. 60–66, 2020. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/2279. Acesso em: 5 apr. 2025.