no. 4
Distance between components in optimal design problems with perimeter penalization
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 641-649. 
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     title = {Distance between components in optimal design problems with perimeter penalization},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {641--649},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 28},
     number = {4},
     year = {1999},
     mrnumber = {1760534},
     zbl = {0957.49028},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1999_4_28_4_641_0/}
}
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Larsen, Christopher J. Distance between components in optimal design problems with perimeter penalization. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 641-649. http://archive.numdam.org/item/ASNSP_1999_4_28_4_641_0/

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