no. 2
Convergence of approximate splines via pseudo-inverses
ESAIM: Modélisation mathématique et analyse numérique, Volume 21 (1987) no. 2, pp. 261-267 
@article{M2AN_1987__21_2_261_0,
     author = {Delvos, Franz-J\"urgen and Schempp, Walter},
     title = {Convergence of approximate splines via pseudo-inverses},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {261--267},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {21},
     number = {2},
     year = {1987},
     mrnumber = {896243},
     zbl = {0629.65057},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1987__21_2_261_0/}
}
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Delvos, Franz-Jürgen; Schempp, Walter. Convergence of approximate splines via pseudo-inverses. ESAIM: Modélisation mathématique et analyse numérique, Volume 21 (1987) no. 2, pp. 261-267. https://www.numdam.org/item/M2AN_1987__21_2_261_0/

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