Blow up of positive initial-energy solutions to systems of nonlinear wave equations with degenerate damping and source terms. Nonlinear Studies, [S. l.], v. 19, n. 4, 2012. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/702. Acesso em: 9 jun. 2026.