no. 3
An optimization problem in heat conduction
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 3, pp. 355-387. 
@article{ASNSP_1987_4_14_3_355_0,
     author = {Aguilera, N. E. and Caffarelli, Luis and Spruck, Joel},
     title = {An optimization problem in heat conduction},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {355--387},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 14},
     number = {3},
     year = {1987},
     zbl = {0668.49022},
     mrnumber = {951225},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1987_4_14_3_355_0/}
}
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Aguilera, N. E.; Caffarelli, L. A.; Spruck, J. An optimization problem in heat conduction. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 14 (1987) no. 3, pp. 355-387. http://www.numdam.org/item/ASNSP_1987_4_14_3_355_0/

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