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Work supported in part by Fondi M.P.I. 40%.
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Alessandrini, G. Matzoh ball soup: A symmetry result for the heat equation. J. Anal. Math. 54, 229–236 (1990). https://doi.org/10.1007/BF02796149
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DOI: https://doi.org/10.1007/BF02796149