no. 2
The dipole solution for the porous medium equation in several space dimensions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 2, pp. 193-217 
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     author = {Hulshof, Josephus and Vazquez, Juan Luis},
     title = {The dipole solution for the porous medium equation in several space dimensions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {193--217},
     year = {1993},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {2},
     mrnumber = {1233636},
     zbl = {0832.35082},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1993_4_20_2_193_0/}
}
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Hulshof, Josephus; Vazquez, Juan Luis. The dipole solution for the porous medium equation in several space dimensions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 2, pp. 193-217. https://www.numdam.org/item/ASNSP_1993_4_20_2_193_0/

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