no. 2
On the Hölder-continuity of solutions of a nonlinear parabolic variational inequality
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 2, pp. 345-357. 
@article{ASNSP_1973_3_27_2_345_0,
     author = {Bui An Ton},
     title = {On the {H\"older-continuity} of solutions of a nonlinear parabolic variational inequality},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {345--357},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 27},
     number = {2},
     year = {1973},
     zbl = {0286.35049},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1973_3_27_2_345_0/}
}
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Bui An Ton. On the Hölder-continuity of solutions of a nonlinear parabolic variational inequality. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 2, pp. 345-357. http://archive.numdam.org/item/ASNSP_1973_3_27_2_345_0/

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