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Partially supported by Inst. of Appl. & Comp. Math., Crete, Greece.
Partially supported by NSF Grant 9101324.
Partially supported by MURST 40% equadiff.
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Athanasopoulos, I., Caffarelli, L. & Salsa, S. Regularity of the free boundary in parabolic phase-transition problems. Acta Math. 176, 245–282 (1996). https://doi.org/10.1007/BF02551583
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DOI: https://doi.org/10.1007/BF02551583