BIKTASHEV, V. N. Envelope equations for modulated non-conservative waves. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 1, p. 285–320, 2003. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1717. Acesso em: 19 may. 2024.