Simultaneous approximation in negative norms of arbitrary order
RAIRO. Analyse numérique, Tome 15 (1981) no. 3, pp. 231-235.
@article{M2AN_1981__15_3_231_0,
     author = {Helfrich, Hans-Peter},
     title = {Simultaneous approximation in negative norms of arbitrary order},
     journal = {RAIRO. Analyse num\'erique},
     pages = {231--235},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {15},
     number = {3},
     year = {1981},
     mrnumber = {631677},
     zbl = {0495.41010},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1981__15_3_231_0/}
}
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Helfrich, Hans-Peter. Simultaneous approximation in negative norms of arbitrary order. RAIRO. Analyse numérique, Tome 15 (1981) no. 3, pp. 231-235. http://archive.numdam.org/item/M2AN_1981__15_3_231_0/

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