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| journal = Discrete Cont. Dynamical Systems

...gemi, K. Yokoyama, The null condition and global existence of solutions to systems of wave equations with different speeds, Adv. Nonlinear PDE and Stochastics ...V. Moncrief, ''[http://www.arxiv.org/abs/gr-qc/0110111 Elliptic-Hyperbolic systems and the Einstein equations]'', Ann. Henri Poincaré '''4''' (2003), 1-34