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T. Sideris, S. Tu. Global existence for systems of nonlinear wave equations in 3D with multiple speeds (English Summary). SIAM J. Math. Anal., 33 (2001), 477--488 (electronic). MathSciNet, arXiv.
T. Sideris, S. Tu. Global existence for systems of nonlinear wave equations in 3D with multiple speeds (English Summary). SIAM J. Math. Anal., 33 (2001), 477--488 (electronic). MathSciNet, arXiv.