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In a recent paper Liu considered the complete Schwarzschild interior andexterior solution in harmonic coordinates. There he argued about the necessityto keep an integration constant, in contrast with previous treatments. Thepurpose of this comment is to show that the above conclusion cannot be tracedfrom the matching conditions between the vacuum exterior and the uniformdensity interior perfect fluid, as claimed.

Comment on "The complete Schwarzschild interior and exterior solution in the harmonic coordinate system" [J. Math. Phys. 39, 6086 (1998)]