We show a global Lipschitz estimate in determining a source term in a hyperbolic equation from overdetermining data on the lateral boundary. The method is a combination of the uniqueness result by the Carleman estimate and the compactness - uniqueness argument, and is also widely applicable to the determination of source terms or coefficients in the general multidimensional case. Dedicated to Professor Takashi Kayano on his 63rd birthday
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Puel et al. (1996) studied this question.
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