Local calibrations for minimizers of the Mumford-Shah functional with a regular discontinuity set
Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 4, pp. 403-436. 
@article{AIHPC_2001__18_4_403_0,
     author = {Mora, Maria Giovanna and Morini, Massimiliano},
     title = {Local calibrations for minimizers of the {Mumford-Shah} functional with a regular discontinuity set},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {403--436},
     publisher = {Elsevier},
     volume = {18},
     number = {4},
     year = {2001},
     zbl = {1052.49018},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_2001__18_4_403_0/}
}
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Mora, Maria Giovanna; Morini, Massimiliano. Local calibrations for minimizers of the Mumford-Shah functional with a regular discontinuity set. Annales de l'I.H.P. Analyse non linéaire, Tome 18 (2001) no. 4, pp. 403-436. http://www.numdam.org/item/AIHPC_2001__18_4_403_0/

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