Dias JP, Figueira M. On the Existence of Weak Solutions for a Semilinear Singular Hyperbolic Systems. Rev. mat. complut. [Internet]. 1991 Jan. 1 [cited 2026 Jul. 29];4(1):137. Available from: https://revistas.ucm.es/index.php/REMA/article/view/REMA9191120137A