no. 2
A numerical approach to a class of unilateral elliptic problems of non-variational type
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 25 (1991) no. 2, pp. 253-269. 
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     author = {Finzi Vita, S.},
     title = {A numerical approach to a class of unilateral elliptic problems of non-variational type},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
     pages = {253--269},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {25},
     number = {2},
     year = {1991},
     zbl = {0715.65083},
     mrnumber = {1097146},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1991__25_2_253_0/}
}
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Finzi Vita, S. A numerical approach to a class of unilateral elliptic problems of non-variational type. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 25 (1991) no. 2, pp. 253-269. http://archive.numdam.org/item/M2AN_1991__25_2_253_0/

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