1. The global Goursat problem and scattering for nonlinear wave equations;Baez;J. Funct. Anal.,1990
2. Finite-time blow-up of solutions to semilinear wave equations;Belchev;J. Funct. Anal.,2002
3. Global solutions of nonlinear hyperbolic equations for small initial data;Christodoulou;Comm. Pure Appl. Math.,1986
4. R. Penrose, Conformal treatment of infinity. 1964 Relativité, Groupes et Topologie (Lectures, Les Houches, 1963 Summer School of Theoret. Phys., Univ. Grenoble) pp. 563–584
5. Global existence and nonexistence for a nonlinear wave equation with damping and source terms;Zhou;Math. Nachr.,2005