On spectral approximation. Part 1. The problem of convergence
RAIRO. Analyse numérique, Tome 12 (1978) no. 2, pp. 97-112.
partie suivante On spectral approximation. Part 2. Error estimates for the Galerkin method 
@article{M2AN_1978__12_2_97_0,
     author = {Descloux, Jean and Nassif, Nabil and Rappaz, Jacques},
     title = {On spectral approximation. {Part} 1. {The} problem of convergence},
     journal = {RAIRO. Analyse num\'erique},
     pages = {97--112},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {12},
     number = {2},
     year = {1978},
     mrnumber = {483400},
     zbl = {0393.65024},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1978__12_2_97_0/}
}
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Descloux, Jean; Nassif, Nabil; Rappaz, Jacques. On spectral approximation. Part 1. The problem of convergence. RAIRO. Analyse numérique, Tome 12 (1978) no. 2, pp. 97-112. http://www.numdam.org/item/M2AN_1978__12_2_97_0/

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