no. 4
Continuity of solutions of the porous media equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 659-675. 
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     title = {Continuity of solutions of the porous media equation},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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Gilding, B. H.; Peletier, L. A. Continuity of solutions of the porous media equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 659-675. http://archive.numdam.org/item/ASNSP_1981_4_8_4_659_0/

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