E. RAMA; K. SAMBAIAH. Solution of one dimensional wave equation and wave-like equations with variable coefficients using variational iteration method. Malaya Journal of Matematik, India, v. 9, n. 01, p. 902–904, 2021. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1187. Acesso em: 22 nov. 2024.