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$$L^p-L^q$$ estimates for the Klein-Gordon equation. (English) Zbl 0457.47040

##### MSC:
 47F05 General theory of partial differential operators 47A30 Norms (inequalities, more than one norm, etc.) of linear operators 35L99 Hyperbolic equations and hyperbolic systems 42B15 Multipliers for harmonic analysis in several variables 35B40 Asymptotic behavior of solutions to PDEs 35P25 Scattering theory for PDEs