no. 2
Superconvergence of the gradient of finite element solutions
RAIRO. Analyse numérique, Tome 13 (1979) no. 2, pp. 139-166. 
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     author = {Lesaint, Pierre and Zlamal, Milos},
     title = {Superconvergence of the gradient of finite element solutions},
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     pages = {139--166},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {13},
     number = {2},
     year = {1979},
     mrnumber = {533879},
     zbl = {0412.65051},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1979__13_2_139_0/}
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Lesaint, Pierre; Zlamal, Milos. Superconvergence of the gradient of finite element solutions. RAIRO. Analyse numérique, Tome 13 (1979) no. 2, pp. 139-166. http://www.numdam.org/item/M2AN_1979__13_2_139_0/

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