Symmetrization of systems of conservation equations and the converse to the condition of Friedrichs and Lax. Archives of Mechanics, [S. l.], v. 49, n. 5, p. 865–876, 1997. Disponível em: https://am3.ippt.pan.pl/index.php/am/article/view/v49p865. Acesso em: 13 may. 2025.