Convergence of the discrete free boundaries for finite element approximations
RAIRO. Analyse numérique, Tome 17 (1983) no. 4, pp. 385-395. 
@article{M2AN_1983__17_4_385_0,
     author = {Brezzi, F. and Caffarelli, L. A.},
     title = {Convergence of the discrete free boundaries for finite element approximations},
     journal = {RAIRO. Analyse num\'erique},
     pages = {385--395},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {17},
     number = {4},
     year = {1983},
     mrnumber = {713766},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1983__17_4_385_0/}
}
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Brezzi, F.; Caffarelli, L. A. Convergence of the discrete free boundaries for finite element approximations. RAIRO. Analyse numérique, Tome 17 (1983) no. 4, pp. 385-395. http://archive.numdam.org/item/M2AN_1983__17_4_385_0/

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