Mr1997
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K. Moriyama. Normal forms and global existence of solutions to a class of cubic nonlinear Klein-Gordon equations in one space dimension. DIE, 10 (1997), 499-520. MathSciNet, arXiv.
K. Moriyama. Normal forms and global existence of solutions to a class of cubic nonlinear Klein-Gordon equations in one space dimension. DIE, 10 (1997), 499-520. MathSciNet, arXiv.