no. 2
Near-best approximations to the solution of Fredholm integral equation of the second kind
RAIRO. Analyse numérique, Tome 16 (1982) no. 2, pp. 129-141 
@article{M2AN_1982__16_2_129_0,
     author = {Levin, David},
     title = {Near-best approximations to the solution of {Fredholm} integral equation of the second kind},
     journal = {RAIRO. Analyse num\'erique},
     pages = {129--141},
     year = {1982},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {16},
     number = {2},
     mrnumber = {661452},
     zbl = {0483.65073},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1982__16_2_129_0/}
}
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Levin, David. Near-best approximations to the solution of Fredholm integral equation of the second kind. RAIRO. Analyse numérique, Tome 16 (1982) no. 2, pp. 129-141. https://www.numdam.org/item/M2AN_1982__16_2_129_0/

[1] C. T. H. Baker, Numerical solution oj integral equation, L M DELVES, J WALSH eds Clarendon Press, Oxford, 1974.

[2] D. Levin, Near-best approximations to some problems in applied mathematics, Report TR/66, Department of Mathematics, Brunei Umversity, 1976.

[3] D. Levin, Corrected collocation approximations for the harmonic Dirichlet problem, aths Applics, 26, 1980, 65-75. | Zbl | MR

[4] S. A. Pruess, Estimating the eigenvalues of Sturm-Liouville problems by approximat ferential equation, SIAM J Numer Anal, 10, 1973, 55-68. | Zbl | MR