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Sponsored by the United States Army under contract No. DAAG29-80-C-0041 and the National Science Foundation under Grant No. DMS-8351187
Supported by Office of Naval Research under Contract N0014-83-0422
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Höllig, K., Kreiss, H.O. C ∞-Regularity for the porous medium equation. Math Z 192, 217–224 (1986). https://doi.org/10.1007/BF01179424
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DOI: https://doi.org/10.1007/BF01179424