On the existence of flux as a function of the surface elevation for long wave solution of shallow water equations. Electronic Journal of Applied Mathematics, [S. l.], v. 2, n. 1, p. 22–29, 2024. DOI: 10.61383/ejam.20242154. Disponível em: https://ejamjournal.com/index.php/ejam/article/view/ejam.20242154. Acesso em: 14 mar. 2025.