MetSo-p
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J. Metcalfe, C.D. Sogge. Hyperbolic trapped rays and global existence of quasilinear wave equations. Invent. Math., 159 (2005), 75--117. MathSciNet, arXiv.
J. Metcalfe, C.D. Sogge. Hyperbolic trapped rays and global existence of quasilinear wave equations. Invent. Math., 159 (2005), 75--117. MathSciNet, arXiv.