W. Larecki, “Symmetrization of systems of conservation equations and the converse to the condition of Friedrichs and Lax”, Arch. Mech., vol. 49, no. 5, pp. 865–876, Jan. 1997, Accessed: Jan. 17, 2026. [Online]. Available: http://am.ippt.gov.pl/index.php/am/article/view/v49p865