no. 4
Error estimates for some quasi-interpolation operators
ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 4, pp. 695-713. 
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     pages = {695--713},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {4},
     year = {1999},
     mrnumber = {1726480},
     zbl = {0938.65125},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1999__33_4_695_0/}
}
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Verfürth, Rüdiger. Error estimates for some quasi-interpolation operators. ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 4, pp. 695-713. http://www.numdam.org/item/M2AN_1999__33_4_695_0/

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