no. 4
Hölder regularity theorem for a class of linear nonuniformly elliptic operators with measurable coefficients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 10 (1983) no. 4, pp. 523-541 
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     author = {Franchi, Bruno and Lanconelli, Ermanno},
     title = {H\"older regularity theorem for a class of linear nonuniformly elliptic operators with measurable coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {523--541},
     year = {1983},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 10},
     number = {4},
     mrnumber = {753153},
     zbl = {0552.35032},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1983_4_10_4_523_0/}
}
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Franchi, Bruno; Lanconelli, Ermanno. Hölder regularity theorem for a class of linear nonuniformly elliptic operators with measurable coefficients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 10 (1983) no. 4, pp. 523-541. https://www.numdam.org/item/ASNSP_1983_4_10_4_523_0/

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