Sa1983
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J. Shatah. Unstable ground state of nonlinear Klein Gordon equations. Trans. Amer. Math. Soc, 290 (1985), 701-710. MathSciNet, arXiv.
J. Shatah. Unstable ground state of nonlinear Klein Gordon equations. Trans. Amer. Math. Soc, 290 (1985), 701-710. MathSciNet, arXiv.