no. 4
Local regularity for minimizers of non convex integrals
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 4, pp. 603-636. 
@article{ASNSP_1989_4_16_4_603_0,
     author = {Acerbi, Emilio and Fusco, Nicola},
     title = {Local regularity for minimizers of non convex integrals},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {603--636},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 16},
     number = {4},
     year = {1989},
     zbl = {0829.49025},
     mrnumber = {1052736},
     language = {en},
     url = {archive.numdam.org/item/ASNSP_1989_4_16_4_603_0/}
}
Acerbi, E.; Fusco, N. Local regularity for minimizers of non convex integrals. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 16 (1989) no. 4, pp. 603-636. http://archive.numdam.org/item/ASNSP_1989_4_16_4_603_0/

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