Lower bounds for blow-up time of coupled nonlinear Klein-Gordon equations. Gulf Journal of Mathematics, [S. l.], v. 5, n. 2, 2017. DOI: 10.56947/gjom.v5i2.97. Disponível em: https://gjom.org/index.php/gjom/article/view/97. Acesso em: 23 sep. 2026.