ISLAM, Saeed; SADDIQ, Syed Farasat; ZAMAN, Gul; KHAN, Muhammad Altaf; AHMAD, Farooq; ULLAH, Murad. Analytical solution of an SEIV epidemic model by Homotopy Perturbation method. VFAST Transactions on Mathematics, [S. l.], v. 1, n. 1, p. 21–27, 2013. DOI: 10.21015/vtm.v1i2.43. Disponível em: https://vfast.org/journals/index.php/VTM/article/view/43. Acesso em: 14 may. 2026.