On the Existence of Global Oscillation Waves for a Class of 3x3 Semilinear Hyperbolic Equations. Journal of Partial Differential Equations, [S. l.], v. 12, n. 3, p. 243–250, 1999. Disponível em: https://global-sci.com/index.php/jpde/article/view/3915. Acesso em: 5 dec. 2025.