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We study stability aspects for the determination of space and time-dependentlower order perturbations of the wave operator in three space dimensions withpoint sources. The problems under consideration here are formally determinedand we establish Lipschitz stability results for these problems. The main toolin our analysis is a modified version of Bukgheim-Klibanov method based onCarleman estimates.

Point sources and stability for an inverse problem for a hyperbolic PDE with space and time dependent coefficients