no. R2
Approximation of an elliptic boundary value problem with unilateral constraints
Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 9 (1975) no. R2, pp. 5-12. 
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     author = {Falk, Richard S.},
     title = {Approximation of an elliptic boundary value problem with unilateral constraints},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Analyse num\'erique},
     pages = {5--12},
     publisher = {Dunod},
     address = {Paris},
     volume = {9},
     number = {R2},
     year = {1975},
     mrnumber = {390477},
     zbl = {0316.65024},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1975__9_2_5_0/}
}
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Falk, Richard S. Approximation of an elliptic boundary value problem with unilateral constraints. Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 9 (1975) no. R2, pp. 5-12. http://archive.numdam.org/item/M2AN_1975__9_2_5_0/

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