CH. MESSIKH. A blow up result in the Cauchy problem for a semi-linear accretive wave equation. Global Journal of Science Frontier Research, [S. l.], v. 11, n. 4, p. 1–9, 2011. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/242. Acesso em: 2 may. 2024.