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The main results were obtained while the author was visiting Stanford in summer 1974. She is indebted to Professor Schiffer for his encouragement and for many helpful discussions.
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Bandle, C. On symmetrizations in parabolic equations. J. Anal. Math. 30, 98–112 (1976). https://doi.org/10.1007/BF02786706
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DOI: https://doi.org/10.1007/BF02786706