no. 4
A note on polynomial approximation in Sobolev spaces
ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 4, pp. 715-719. 
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     author = {Verf\"urth, R\"udiger},
     title = {A note on polynomial approximation in {Sobolev} spaces},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {715--719},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {4},
     year = {1999},
     mrnumber = {1726481},
     zbl = {0936.41006},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1999__33_4_715_0/}
}
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Verfürth, Rüdiger. A note on polynomial approximation in Sobolev spaces. ESAIM: Modélisation mathématique et analyse numérique, Tome 33 (1999) no. 4, pp. 715-719. http://www.numdam.org/item/M2AN_1999__33_4_715_0/

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