Approximation by finite element functions using local regularization
Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 9 (1975) no. R2, pp. 77-84. 
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     author = {Cl\'ement, Ph.},
     title = {Approximation by finite element functions using local regularization},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Analyse num\'erique},
     pages = {77--84},
     publisher = {Dunod},
     address = {Paris},
     volume = {9},
     number = {R2},
     year = {1975},
     mrnumber = {400739},
     zbl = {0368.65008},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1975__9_2_77_0/}
}
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Clément, Ph. Approximation by finite element functions using local regularization. Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 9 (1975) no. R2, pp. 77-84. http://www.numdam.org/item/M2AN_1975__9_2_77_0/

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