AHMED, J.; HUSSAIN, F. Analytical solution of system of differential equations by variational iteration method. BIBECHANA, [S. l.], v. 13, p. 77–86, 2015. DOI: 10.3126/bibechana.v13i0.13394. Disponível em: https://nepjol.info./index.php/BIBECHANA/article/view/13394. Acesso em: 26 dec. 2024.