OzTyTs1997

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T. Ozawa, K. Tsutaya, Y. Tsutsumi. Remarks on the Klein-Gordon equation with quadratic nonlinearity in two space dimensions (English summary). GAKUTO Internat. Ser. Math. Sci. Appl., 10 (1997), Nonlinear waves (Sapporo, 1995), 383--392. MathSciNet, arXiv.