1. An elementary proof of global or almost global existence for quasilinear wave equations;Hidano;Tohoku Math. J.,2004
2. F. John, Non-existence of global solutions of □u=∂/∂tF(ut) in two and three dimensions, MRC Technical Summary Report, 1984
3. Global and almost global existence for systems of nonlinear wave equations with different propagation speeds;Katayama;Differential Integral Equations,2004
4. Global existence for a class of systems nonlinear wave equations in three dimensions;Katayama;Chinese Ann. Math.,2004
5. Global existence for systems of wave equations with nonresonant nonlinearities and null forms;Katayama;J. Differential Equations,2005