Sa1994b
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J. Shatah, Geometric wave equations, Recent advances in partial differential equations (El Escorial, 1992), 99-114, RAM Res. Appl. Math., 30, Masson, Paris, 1994.
J. Shatah, Geometric wave equations, Recent advances in partial differential equations (El Escorial, 1992), 99-114, RAM Res. Appl. Math., 30, Masson, Paris, 1994.