no. 1
On the regularity of solutions to a nonvariational elliptic equation
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 11 (2002) no. 1, pp. 47-56. 
@article{AFST_2002_6_11_1_47_0,
     author = {D'Onofrio, Luigi and Greco, Luigi},
     title = {On the regularity of solutions to a nonvariational elliptic equation},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {47--56},
     publisher = {Universit\'e Paul Sabatier. Facult\'e des sciences},
     address = {Toulouse},
     volume = {Ser. 6, 11},
     number = {1},
     year = {2002},
     mrnumber = {1986382},
     zbl = {01982058},
     language = {en},
     url = {http://www.numdam.org/item/AFST_2002_6_11_1_47_0/}
}
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D'Onofrio, Luigi; Greco, Luigi. On the regularity of solutions to a nonvariational elliptic equation. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 11 (2002) no. 1, pp. 47-56. http://www.numdam.org/item/AFST_2002_6_11_1_47_0/

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