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The author was partially supported by the National Science Foundation under grant DMS-8618755.
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Khavinson, D., Shapiro, H.S. Remarks on the reflection principle for harmonic functions. J. Anal. Math. 54, 60–76 (1990). https://doi.org/10.1007/BF02796142
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DOI: https://doi.org/10.1007/BF02796142